Konstantinos Genidounias (born 3 May 1993) is a Greek water polo player.

[1] He was part of the Greek team that won the bronze medal at the 2015 World Aquatics Championships.

He was a member of the team that competed for Greece at the 2016 Summer Olympics.

[2] Graduated with a degree of communications from the University of Southern California where he attended from 2011 to 2014 and was a member of the Men's Water Polo Team winning three consecutive NCAA championships with the USC Trojans under head coach Jovan Vavic.

He plays for Greek powerhouse Olympiacos, with whom he won the 2017–18 LEN Champions League.