Infobox last updated on: August 26, 2007.
Justin Gimelstob (b. 26 January, 1977, in Livingston, New Jersey) is a retired American tennis player. He won the 1998 Australian Open and French Open mixed doubles titles with Venus Williams as his partner. In singles matches, he has defeated Andre Agassi, Petr Korda, Alex Corretja, Patrick Rafter, and Gustavo Kuerten.
Gimelstob has been a resident of Morristown, New Jersey.