

<!-- RRD ActiveDisclosure(SM) XBRL Schema Document - http://www.financial.rrd.com/ -->
<!-- Creation Date      : 2016-10-21T14:32:52.9295373+00:00 -->
<!-- Version            : 2.3.7.21 -->
<!-- Package ID         : C5E47772CDB490FD181BBDE6D6FD0779-0001056696-001608 -->
<!-- Copyright (c) 2016 R. R. Donnelley & Sons Company. All Rights Reserved. -->
<schema xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:manh="http://www.manh.com/20160930" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:us-types="http://fasb.org/us-types/2016-01-31" xmlns:stpr="http://xbrl.sec.gov/stpr/2011-01-31" xmlns:naics="http://xbrl.sec.gov/naics/2011-01-31" xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:us-gaap="http://fasb.org/us-gaap/2016-01-31" xmlns:dei="http://xbrl.sec.gov/dei/2014-01-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:country="http://xbrl.sec.gov/country/2016-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:currency="http://xbrl.sec.gov/currency/2016-01-31" xmlns:exch="http://xbrl.sec.gov/exch/2016-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.manh.com/20160930" xmlns="http://www.w3.org/2001/XMLSchema">
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</schema>





