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  <dei:EntityRegistrantName contextRef="Duration_02Feb2012_01Feb2013">NORTHEAST INVESTORS TRUST</dei:EntityRegistrantName>
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  <rr:ProspectusDate contextRef="Duration_02Feb2012_01Feb2013">2013-02-01</rr:ProspectusDate>
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  <rr:ObjectiveHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Investment Objective:</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Northeast Investors Trust (the "Trust") is a no-load high-yield bond fund whose primary objective is the production of income.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Fees and Expenses:</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">These tables describe the fees and expenses that you may pay if you buy and hold shares of the Trust.</rr:ExpenseNarrativeTextBlock>
  <rr:ShareholderFeesCaption contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Shareholder Fees (Fees Paid Directly From Your Investment)</rr:ShareholderFeesCaption>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumDeferredSalesChargeOverOther decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOther>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0</rr:RedemptionFeeOverRedemption>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.005</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.0055</rr:OtherExpensesOverAssets>
  <rr:Component1OtherExpensesOverAssets decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.0005</rr:Component1OtherExpensesOverAssets>
  <rr:Component2OtherExpensesOverAssets decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.005</rr:Component2OtherExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.0105</rr:ExpensesOverAssets>
  <rr:OperatingExpensesCaption contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Annual Trust Operating Expenses (Expenses Deducted From Fund Assets)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="USD">107</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="USD">334</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="USD">579</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="USD">1283</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Example</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">This example is intended to help you compare the cost of investing in the Trust with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Trust for the time periods indicated and redeem at the end of the period. The example also assumes that your investment has a 5% return each year, including reinvested dividends and distributions, and that the Trust's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.1463</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_02Feb2012_01Feb2013AfterTaxesOnDistributions_MemberS000011440_MemberC000031645_Member" unitRef="pure">0.1192</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_02Feb2012_01Feb2013AfterTaxesOnDistributionsAndSales_MemberS000011440_MemberC000031645_Member" unitRef="pure">0.0941</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 id="Item_2" decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberBankOfAmericaMerrillLynchHighYieldIndex_Member" unitRef="pure">0.1558</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.0464</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_02Feb2012_01Feb2013AfterTaxesOnDistributions_MemberS000011440_MemberC000031645_Member" unitRef="pure">0.0182</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_02Feb2012_01Feb2013AfterTaxesOnDistributionsAndSales_MemberS000011440_MemberC000031645_Member" unitRef="pure">0.0219</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 id="Item_3" decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberBankOfAmericaMerrillLynchHighYieldIndex_Member" unitRef="pure">0.1</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 id="Item_4" decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberBankOfAmericaMerrillLynchHighYieldIndex_Member" unitRef="pure">0.1038</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_02Feb2012_01Feb2013AfterTaxesOnDistributionsAndSales_MemberS000011440_MemberC000031645_Member" unitRef="pure">0.0384</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_02Feb2012_01Feb2013AfterTaxesOnDistributions_MemberS000011440_MemberC000031645_Member" unitRef="pure">0.0367</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.0654</rr:AverageAnnualReturnYear10>
  <rr:AnnualReturn2003 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.1435</rr:AnnualReturn2003>
  <rr:AnnualReturn2004 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.1438</rr:AnnualReturn2004>
  <rr:AnnualReturn2005 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.0223</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.121</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.0017</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">-0.3727</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.5379</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.1425</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">-0.0072</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.1463</rr:AnnualReturn2012>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member">Best quarter:</rr:HighestQuarterlyReturnLabel>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member">Worst quarter:</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0.3146</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">-0.2822</rr:BarChartLowestQuarterlyReturn>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Portfolio Turnover:</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">The Trust pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Trust shares are held in a taxable account. These costs, which are not reflected in annual Trust operating expenses or in the example, affect the Trust's performance. During the most recent fiscal year, the Trust's portfolio turnover rate was 25.36% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Primary Investment Strategies:</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">The Trustees invest primarily in marketable securities of established companies which the Trustees believe provide reasonable income and which, where consistent with this objective, may have potential for capital appreciation. The Trust's portfolio emphasizes debt securities which are rated as lower than investment grade by either of the two principal rating services or unrated securities having similar characteristics (sometimes referred to as "junk bonds").</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Principal Risks:</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Risk of Lower Rated Debt Securities. Lower rated debt securities may be subject to increased market volatility based on factors such as: the ability of an issuer to make its current interest payments, the potential for principal loss if an issuer declares bankruptcy, and the potential difficulty in disposing of certain securities and therefore can present an increased risk of investment loss.&lt;br/&gt;&lt;br/&gt;Income Risk. The chance that falling interest rates and/or defaults will cause the Trust's income to decline. Shareholders should expect the Trust's quarterly income to fluctuate.&lt;br/&gt;&lt;br/&gt;Interest Rate Risk. The chance that the value of bonds tends to fall as interest rates rise. Longer-term debt securities are more sensitive to interest rate changes than those with shorter maturities.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Performance Information:</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">The following performance related information provides some indication of the risks of investing in the Trust. The bar chart shows how the Trust's performance (including operating expenses) varied from one calendar year to another over the past ten years. The table shows the average annual returns (including operating expenses) compared with those of a relevant market index over set periods of time. The table also presents the impact of taxes on the Trust's returns. To calculate these figures, we used the highest individual federal marginal income and capital gains tax rates in effect at the time of each distribution, but we do not take into consideration state or local income taxes. Return after taxes on distributions and sale of Trust shares may be higher than other returns for the same period due to the tax benefit of realizing a capital loss on the sale of Trust shares. Actual after-tax returns depend on the individual investor's tax situation and may differ from those shown.&lt;br/&gt;&lt;br/&gt;Please note that if you own the Trust in a tax-deferred account, such as an individual retirement account or a 401(k) plan, this after-tax information does not apply to your investment, because such accounts are subject to taxes only upon distribution. Keep in mind that past performance - whether before taxes or after taxes - does not guarantee future results.&lt;br/&gt;&lt;br/&gt;The Trust may experience short-term swings of performance as suggested by the best and worst calendar quarter returns.</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Average Annual Total Return&lt;br/&gt;for the Periods Ended December 31, 2012</rr:PerformanceTableHeading>
  <rr:BarChartHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Annual Total Returns:</rr:BarChartHeading>
  <rr:BarChartNarrativeTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">The following bar chart shows the change in value of the Trust's shares over the past 10 years. It illustrates how the returns can differ one year to the next.</rr:BarChartNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Best quarter: 2nd quarter 2009, up 31.46% Worst quarter: 4th quarter 2008, down 28.22%</rr:BarChartClosingTextBlock>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_MemberC000031645_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:RiskReturnHeading contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">SUMMARY SECTION</rr:RiskReturnHeading>
  <rr:PerformanceTableClosingTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">You can find the Trust's prospectus and other information about the Trust, including the Statement of Additional Information and the most recent reports to shareholders online at www.northeastinvestors.com. You can also get this information at no cost by calling 800-225-6704 or by sending an email to website@northeastinvestors.com.</rr:PerformanceTableClosingTextBlock>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">800-225-6704</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">www.northeastinvestors.com</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_02Feb2012_01Feb2013S000011440_Member" unitRef="pure">0.2536</rr:PortfolioTurnoverRate>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">The bar chart shows how the Trust's performance (including operating expenses) varied from one calendar year to another over the past ten years. The table shows the average annual returns (including operating expenses) compared with those of a relevant market index over set periods of time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">The table also presents the impact of taxes on the Trust's returns. To calculate these figures, we used the highest individual federal marginal income and capital gains tax rates in effect at the time of each distribution, but we do not take into consideration state or local income taxes.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableExplanationAfterTaxHigher contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Return after taxes on distributions and sale of Trust shares may be higher than other returns for the same period due to the tax benefit of realizing a capital loss on the sale of Trust shares.</rr:PerformanceTableExplanationAfterTaxHigher>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Please note that if you own the Trust in a tax-deferred account, such as an individual retirement account or a 401(k) plan, this after-tax information does not apply to your investment, because such accounts are subject to taxes only upon distribution.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">Keep in mind that past performance - whether before taxes or after taxes - does not guarantee future results.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">&lt;div style="display:none"&gt;~ http://www.northeastinvestors.com/role/ScheduleShareholderFeesNORTHEASTINVESTORSTRUST column period compact * ~&lt;/div&gt;

</rr:ShareholderFeesTableTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">&lt;div style="display:none"&gt;~ http://www.northeastinvestors.com/role/ScheduleAnnualTrustOperatingExpensesNORTHEASTINVESTORSTRUST column period compact * ~&lt;/div&gt;

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  <rr:BarChartTableTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">&lt;div style="display:none"&gt;~ http://www.northeastinvestors.com/role/ScheduleAnnualTotalReturnsNORTHEASTINVESTORSTRUSTBarChart column period compact * ~&lt;/div&gt;

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  <rr:PerformanceTableTextBlock contextRef="Duration_02Feb2012_01Feb2013S000011440_Member">&lt;div style="display:none"&gt;~ http://www.northeastinvestors.com/role/ScheduleAverageAnnualTotalReturnsTransposedNORTHEASTINVESTORSTRUST column period compact * ~&lt;/div&gt;

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