Marco Koch (born 25 January 1990) is a German competitive swimmer who specializes in breaststroke events.

[2] At the 2012 Summer Olympics in London, he competed in the men's 200-meter breaststroke, finishing in 11th place overall in the heats and 7th in his semifinal (13th overall), failing to reach the final.

[5] Koch competed at all of the meets for the Breakers, and specialized in the breaststroke events.

[6] In the second ISL season he competed again for the NY Breakers winning in the play-offs four out four 200m breaststroke races with the highest jackpot ever - 30 points.

[1] Although he mainly specializes in breaststroke, Koch also holds the German record in the 400-meter individual medley (short course) with a time of 4:01.87.