Sébastien René Grosjean (; born 29 May 1978) is a French former professional tennis player. Grosjean reached the semifinals at the 2001 Australian and French Opens, and at Wimbledon in 2003 and 2004. He finished eight consecutive seasons ranked in the top 30 (1999–2006), peaking at world No. 4 in October 2002. Grosjean retired from professional tennis in May 2010.
