Marko Osmakcic (; born 10 August 1998) is a Swiss tennis player. Osmakcic has a career high junior ranking of 41. Osmakcic made the third round of the 2015 Australian Open boys singles. In 2015 Osmakcic was invited to the Switzerland Davis Cup team. As of 2020, he participates in the Swiss version of The Bachelorette, where he finished in third place.