Marleen Renders (born 24 December 1968, in Diest) is a retired female long-distance runner from Belgium, who represented her native country thrice at the Summer Olympics: in 1988, 1996 and 2000. In 1995 she won the Antwerp Marathon, in 1998 the Berlin Marathon, and she triumphed twice in the Paris Marathon in 2000 and 2002 (with a personal best of 2:23:05).
She was victorious at the Berlin Half Marathon in 1997 and 1998 and was the 2003 winner of the City-Pier-City Loop half marathon in the Hague. She won the 20 km of Brussels nine times consecutively from 1996 to 2004, which included a course record run of 1:07:46 in 2002.
Renders also competed in cross country running and won Belgium's 1996–97 Lotto Cross Cup series.