<?xml version="1.0" encoding="UTF-8"?>
<edgarSubmission xmlns="http://www.sec.gov/edgar/thirteenffiler" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>13F-HR</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <flags>
        <confirmingCopyFlag>false</confirmingCopyFlag>
        <returnCopyFlag>false</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
      </flags>
      <filer>
        <credentials>
          <cik>0000928749</cik>
          <ccc>XXXXXXXX</ccc>
        </credentials>
      </filer>
      <periodOfReport>12-31-2013</periodOfReport>
    </filerInfo>
  </headerData>
  <formData>
    <coverPage>
      <reportCalendarOrQuarter>12-31-2013</reportCalendarOrQuarter>
      <filingManager>
        <name>KALMAR INVESTMENTS INC /DE/</name>
        <address>
          <com:street1>3701 KENNETT PIKE</com:street1>
          <com:city>GREENVILLE</com:city>
          <com:stateOrCountry>DE</com:stateOrCountry>
          <com:zipCode>19807</com:zipCode>
        </address>
      </filingManager>
      <reportType>13F HOLDINGS REPORT</reportType>
      <form13FFileNumber>028-04496</form13FFileNumber>
      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Marjorie McMenamin</name>
      <title>Client Services Operations Director</title>
      <phone>302-658-7575</phone>
      <signature>Marjorie L McMenamin</signature>
      <city>Wilmington</city>
      <stateOrCountry>DE</stateOrCountry>
      <signatureDate>01-29-2014</signatureDate>
    </signatureBlock>
    <summaryPage>
      <otherIncludedManagersCount>0</otherIncludedManagersCount>
      <tableEntryTotal>152</tableEntryTotal>
      <tableValueTotal>5989619</tableValueTotal>
      <isConfidentialOmitted>false</isConfidentialOmitted>
    </summaryPage>
  </formData>
</edgarSubmission>
