Filip Dewulf (born 15 March 1972 in Mol) is a former professional male tennis player from Belgium.
In his career he won 2 ATP Tour singles titles and 1 title in doubles. In 1997 he reached the semi-finals of the French Open, his best singles result ever and the first Belgian tennis player (male or female) to reach the semi-final at a Grand Slam tournament. He was defeated in four sets by the eventual champion, Gustavo Kuerten. This was, according to Roland Garros itself, the best performance that a qualifier has performed at a French Open, and only the third time in Grand Slam history that a qualifier had reached a semi-final. Dewulf would also reach the quarter-finals at the same event the following year, falling to eventual runner-up Àlex Corretja in straight sets. His career-high singles ranking was World No. 39, achieved in September 1997; he became the first Belgian in ATP Top 50, overall finishing four seasons as the top-ranked Belgian player.