Ronald Jean-Martin Agénor (born November 13, 1964) is a former professional tennis player who represented Haiti during his playing career.

In 1989 he reached the quarterfinals of the French Open where he was defeated by eventual-champion Michael Chang in four sets, and won his first top-level singles title at Athens.

In a career spanning 19 years, he reached the quarter finals at the French Open in 1989 by beating Carl Limberger, Tim Mayotte, Claudio Pistolesi and Sergi Bruguera before losing to champion Michael Chang.

He represented Haiti in the Olympics in Los Angeles in 1984, in Seoul in 1988, and in Atlanta in 1996 and won 3 ATP Tour World titles in Athens, Genoa, and Berlin.

After a break from the pro circuit, Agénor made a comeback in 1999 becoming, at 35 years of age, the oldest player to reach top 100 (ATP ranked #88) in the world since Jimmy Connors did it in 1991.

In 2000, he represented and led the Lido Luzern Tennis Club in Switzerland to its first Swiss National title in 100 years.