Szymon Szewczyk (born December 21, 1982) is a Polish professional basketball player who last played for Anwil Włocławek of the PLK.

After playing two successful seasons in his native Poland, Szewczyk was evaluated by several top teams in Europe before signing with Braunschweig of Germany's top division (Bundesliga I) for the 2002–03 season.

On June 26, 2003, Szewczyk was selected by the Milwaukee Bucks with the 35th pick of the 2003 NBA draft.

On July 11, 2013, the Oklahoma City Thunder acquired Szewczyk's rights in a three team deal with Milwaukee and the Minnesota Timberwolves.

His father Miroslaw Szewczyk was a professional basketball player for more than 20 years in Szczecin.