<?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>P01_01_2013To06_30_2013</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001397183</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>true</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>1</Level><ElementName>us-gaap_RelatedPartyTransactionsAbstract</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="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Related Party Transactions [Abstract]</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</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><PreferredLabelRole>verboseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="P01_01_2013To06_30_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" style="clear:both;width:100%; table-layout:fixed;"&gt;  &lt;tr&gt;  &lt;td&gt;&lt;/td&gt;  &lt;/tr&gt;  &lt;/table&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;MARGIN: 0pt 0px; FONT: 10pt Times New Roman, Times, Serif "&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;&lt;/div&gt;    &lt;table style="clear:both;MARGIN-TOP: 0px; FONT: 10pt Times New Roman, Times, Serif; MARGIN-BOTTOM: 0px"   cellspacing="0" cellpadding="0"&gt;  &lt;tr style="TEXT-ALIGN: justify; VERTICAL-ALIGN: top"&gt;  &lt;td style="TEXT-ALIGN: left; WIDTH: 0.75in"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;&lt;font  style="FONT-SIZE: 10pt"&gt;&lt;strong&gt;NOTE 5&lt;/strong&gt;&lt;/font&gt;&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: justify"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;&lt;font  style="FONT-SIZE: 10pt"&gt;&lt;strong&gt;RELATED PARTY  TRANSACTIONS&lt;/strong&gt;&lt;/font&gt;&lt;/div&gt;  &lt;/td&gt;  &lt;/tr&gt;  &lt;/table&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-ALIGN: justify; TEXT-INDENT: 0.5in; MARGIN: 0pt 0px 0pt 0.75in; FONT: 10pt Times New Roman, Times, Serif"&gt;  &amp;#160;&amp;#160;&lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-ALIGN:Left; TEXT-INDENT: 0in; WIDTH: 100%"&gt;  &lt;table style="clear:both;BORDER-BOTTOM: #9eb6ce 0px solid; BORDER-LEFT: #9eb6ce 0px solid; MARGIN: 0in 0in 0in 0.75in; WIDTH: 88%; BORDER-COLLAPSE: collapse; OVERFLOW: visible; BORDER-TOP: #9eb6ce 0px solid; BORDER-RIGHT: #9eb6ce 0px solid"   cellspacing="0" cellpadding="0" align="left"&gt;  &lt;tr style="HEIGHT: 12px"&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; FONT-WEIGHT: 400"   width="74%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;On  November 19, 2012, the Company entered into a convertible debenture  agreement with a Board Member for $100,000. Under the original  terms of the agreement, Interest is payable at 10% per annum,  payable on the maturity date of May 19, 2013. The Company issued  warrants&amp;#160;to purchase 10,000 shares of the Company Stock, at an  exercise price of $ 1.10.&amp;#160;The debenture is convertible into  shares of Company Common Stock on or before&amp;#160;the Maturity Date,  at a conversion rate of $1.10 per share.&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; FONT-SIZE: 10pt; VERTICAL-ALIGN: middle; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;td style="BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;$&lt;/div&gt;  &lt;/td&gt;  &lt;td style="BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: right; FONT-STYLE: normal; PADDING-RIGHT: 5px; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; FONT-WEIGHT: 400"   width="11%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  100,000&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; FONT-SIZE: 10pt; VERTICAL-ALIGN: middle; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;/tr&gt;    &lt;tr style="HEIGHT: 12px"&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ffffff; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; FONT-WEIGHT: 400"   width="74%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ffffff; FONT-SIZE: 10pt; VERTICAL-ALIGN: middle; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ffffff; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; BORDER-TOP: #000000 1px solid; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: right; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ffffff; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; BORDER-TOP: #000000 1px solid; FONT-WEIGHT: 400"   width="11%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ffffff; FONT-SIZE: 10pt; VERTICAL-ALIGN: middle; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;/tr&gt;    &lt;tr style="HEIGHT: 12px"&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; PADDING-LEFT: 3px; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; FONT-WEIGHT: 400"   width="74%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;Total Due  to Related Parties&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; FONT-SIZE: 10pt; VERTICAL-ALIGN: middle; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;td style="BORDER-BOTTOM: #000000 3px double; TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;$&lt;/div&gt;  &lt;/td&gt;  &lt;td style="BORDER-BOTTOM: #000000 3px double; TEXT-ALIGN: right; FONT-STYLE: normal; PADDING-RIGHT: 5px; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; COLOR: #000000; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom; FONT-WEIGHT: 400"   width="11%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  100,000&lt;/div&gt;  &lt;/td&gt;  &lt;td style="TEXT-ALIGN: left; FONT-STYLE: normal; FONT-FAMILY: Times New Roman; BACKGROUND: #ccffcc; FONT-SIZE: 10pt; VERTICAL-ALIGN: middle; FONT-WEIGHT: 400"   width="1%"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;  &amp;#160;&lt;/div&gt;  &lt;/td&gt;  &lt;/tr&gt;  &lt;/table&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;&lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;&lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;&lt;/div&gt;  &lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-ALIGN: justify; MARGIN: 0pt 0px 0pt 0.8in; FONT: 10pt Times New Roman, Times, Serif"&gt;  &amp;#160;&amp;#160;&amp;#160;     &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-ALIGN: justify; TEXT-INDENT: 0in; MARGIN: 0in"&gt;  &lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-ALIGN: justify; TEXT-INDENT: 0in; MARGIN: 0in"   align="left"&gt;  &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-INDENT: 0in; MARGIN: 0in"&gt;  &lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-INDENT: 0in; MARGIN: 0in"&gt;  &lt;font style="TEXT-INDENT: 0in; MARGIN: 0in" size="2"&gt;On May 19,  2013 a Promissory Note Extension Agreement was signed to extend the  maturity date of the $&lt;font style=" FONT-SIZE: 10pt"&gt;10,000&lt;/font&gt;&lt;font style="BACKGROUND-COLOR: transparent"&gt;debenture&lt;/font&gt; to &lt;font style=" FONT-SIZE: 10pt"&gt;August 19, 2013&lt;/font&gt;.&lt;/font&gt;&lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-INDENT: 0in; MARGIN: 0in"&gt;  &amp;#160;&lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt;TEXT-INDENT: 0in; MARGIN: 0in"&gt;  In June 2013, the Company paid off in full a separate debenture  (dated June 20, 2012), which totaled $&lt;font style=" FONT-SIZE: 10pt"&gt;200,000&lt;/font&gt; plus $&lt;font style=" FONT-SIZE: 10pt"&gt;24,000&lt;/font&gt; interest.&lt;/div&gt;  &lt;/div&gt;  &lt;/div&gt;    &lt;div style="clear:both; FONT-FAMILY:Times New Roman;FONT-SIZE: 10pt"&gt;&lt;/div&gt;  &lt;/div&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 Disclosure [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.ivedasolutions.com/role/RelatedPartyTransactions</RoleURI><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows></InstanceReport>
