Marcin Matkowski (; born 15 January 1981) is a Polish former professional tennis player whose speciality is in doubles. He played college tennis at UCLA, where Jean-Julien Rojer was one of his teammates. Matkowski and Mariusz Fyrstenberg won the Madrid Open twice, in addition to reaching the final at the US Open. The duo also reached the final of the ATP Finals and participated six times at the event overall.
Significant finals
Grand Slam tournament finals
Doubles: 1 (1 runner-up)
Mixed Doubles: 2 (2 runner-ups)
Year-end championships
Doubles: 1 (1 runner-up)
Masters 1000 finals
Doubles: 9 (2 titles, 7 runner-ups)
ATP career finals
Doubles: 48 (18 titles, 30 runner-ups)