<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>110 - Disclosure - Related Party Transactions</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>cx_01_January_2013_TO_30_June_2013</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001088949</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2013-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2013-06-30T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="6 Months Ended" /><Label Key="Calendar" Id="1" Label="Jun. 30, 2013" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>4</Level><ElementName>us-gaap_RelatedPartyTransactionsDisclosureTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="cx_01_January_2013_TO_30_June_2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;table border="0" cellpadding="0" cellspacing="0" style="border-color: black; border-collapse: collapse; font-size: 10pt; font-family: times new roman,times,serif;" width="100%"&gt;
      &lt;tr valign="top"&gt;
        &lt;td align="left"&gt;
          &lt;strong&gt;4.&lt;/strong&gt;
        &lt;/td&gt;
        &lt;td align="left" width="95%"&gt;
          &lt;b&gt;Related Party Transactions&lt;/b&gt;
        &lt;/td&gt;
      &lt;/tr&gt;
    &lt;/table&gt;
    &lt;p align="justify" style="margin-left: 5%; font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      As of December 31, 2012, Navitex Technology, Inc., a company which is controlled by one of the former stockholders of the Company forgave $8,828
      of loan. This amount was recorded as additional paid in capital in 2012. (See Note 5(d)). These loans have no fixed terms of repayment, are unsecured, and bear no interest. During the year ended December 31, 2012 and 2011, the Company imputed interest on these loans of $906
      and $651, respectively.
    &lt;/p&gt;
    &lt;p align="justify" style="margin-left: 5%; font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      On the above transaction, the Company imputed interest at a rate of
      16.67% which is comparable to past borrowings.
    &lt;/p&gt;
    &lt;p align="justify" style="margin-left: 5%; font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      On June 30, 2012 the former officer and director forgave $6,726
      of advances. The total forgiveness of debt was recorded as additional paid in capital in 2012. (See Note 5(d))
    &lt;/p&gt;
    &lt;p align="justify" style="margin-left: 5%; font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      &amp;#160;On July 26, 2012, the former officer and director paid off $31,209
      of liabilities. The amount paid off was recorded as additional paid in capital in 2012. (See Note 5(d))
    &lt;/p&gt;
        &lt;p align="justify" style="margin-left: 5%; font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      During the year ended December 31, 2012, the director paid $32,623
      of expenses on behalf of the Company. The amount paid was recorded as additional paid in capital in 2012. (See Note 5(d))
    &lt;/p&gt;
    &lt;p align="justify" style="margin-left: 5%; font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      During the three months ended March 31, 2013, a related party paid $17,671
      of expenses on behalf of the Company. The amount paid was recorded as additional paid in capital in 2013. (See Note 5(d))
    &lt;/p&gt;
    &lt;p align="justify" style="margin-left: 5%; font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      During the three months ended March 31, 2013, the President contributed $1,000
      of cash to the Company. The amount contributed was recorded as additional paid in capital in 2013. (See Note 5(d))
    &lt;/p&gt;
    &lt;p align="justify" style="margin-left: 5%; font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      During the three months ended June 30, 2013, a related party paid $17,328
      of expenses on behalf of the Company. The amount paid was recorded as additional paid in capital in 2013. (See Note 5(d))
    &lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 850

 -SubTopic 10

 -Section 50

 -Paragraph 4

 -URI http://asc.fasb.org/extlink&amp;oid=6457730&amp;loc=d3e39622-107864



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 850

 -SubTopic 10

 -Section 50

 -Paragraph 3

 -URI http://asc.fasb.org/extlink&amp;oid=6457730&amp;loc=d3e39603-107864



Reference 3: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 850

 -SubTopic 10

 -Section 50

 -Paragraph 1

 -URI http://asc.fasb.org/extlink&amp;oid=6457730&amp;loc=d3e39549-107864



Reference 4: http://www.xbrl.org/2003/role/presentationRef

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 04

 -Paragraph b

 -Article 3A



Reference 5: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 235

 -SubTopic 10

 -Section S99

 -Paragraph 1

 -Subparagraph (SX 210.4-08.(k))

 -URI http://asc.fasb.org/extlink&amp;oid=26873400&amp;loc=d3e23780-122690



Reference 6: http://www.xbrl.org/2003/role/presentationRef

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 08

 -Paragraph k

 -Article 4



Reference 7: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 850

 -SubTopic 10

 -Section 50

 -Paragraph 6

 -URI http://asc.fasb.org/extlink&amp;oid=6457730&amp;loc=d3e39691-107864



Reference 8: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 850

 -SubTopic 10

 -Section 50

 -Paragraph 5

 -URI http://asc.fasb.org/extlink&amp;oid=6457730&amp;loc=d3e39678-107864



</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Related Party Transactions [Text Block]</Label></Row></Rows><Footnotes /><IsEquityReport>false</IsEquityReport><ReportName>Related Party Transactions</ReportName><MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>true</HasCustomUnits><IsEmbedReport>false</IsEmbedReport><IsMultiCurrency>false</IsMultiCurrency><ReportType>Sheet</ReportType><RoleURI>http://www.ewrxinternetsystems.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock</RoleURI><NumberOfCols>1</NumberOfCols><NumberOfRows>1</NumberOfRows></InstanceReport>
