Walt menikah dengan Rebecca E. Stone<ref>{{cite news|title=Rebecca Stone Is Wed to Stephen Walt|url=http://www.nytimes.com/1991/05/05/style/rebecca-stone-is-wed-to-stephen-walt.html|work=The New York Times|date=5 May 1991|accessdate=18 December 2009}}</ref> dan dikaruniai dua anak.<ref>{{cite web|url=http://www.hks.harvard.edu/fs/swalt/files/waltcv06.pdf|title= Stephen Walt's Curriculum Vitae (pdf) |publisher=Harvard Kennedy School |accessdate=9 June 2010}}</ref>
