Konstantine Demetrios "Kostas" Koufos (Greek: Κωνσταντίνος Δημήτριος "Κώστας" Κουφός; born February 24, 1989) is a Greek-American professional basketball player who is a free agent.

He was instrumental in GlenOak snapping Canton McKinley's 41-game win streak in January 2007, when he posted 32 points, 19 rebounds and 10 blocks to help the Golden Eagles edge the Bulldogs, 56–55, in overtime.

He helped the Buckeyes reach the final of the National Invitation Tournament, where they won 92–85 over UMass behind Koufos' 22 points, nine rebounds and three blocked shots.

[9] On July 13, 2010, Koufos was traded, alongside two future first-round draft picks, to the Minnesota Timberwolves in exchange for Al Jefferson.

[10] On February 22, 2011, Koufos was acquired by the Denver Nuggets in a three-way trade involving the Timberwolves and the New York Knicks.

[9] On June 27, 2013, Koufos was traded to the Memphis Grizzlies in exchange for Darrell Arthur and the draft rights to Joffrey Lauvergne.

On July 19, 2019, Koufos signed a two-year deal with CSKA Moscow of the VTB United League and the EuroLeague.

He led his team to the tournament's final game, and although Greece lost in the finals to Serbia's under-18 team, Koufos won the tournament's MVP award, after leading the competition in points, rebounds and blocked shots, with averages of 26.5 points, 13.0 rebounds and 3.5 blocks per game.

[22] In 2009, Koufos debuted with the senior Greek national basketball team, and he competed at the EuroBasket 2009, where he won a bronze medal.

He also played with Greece at the 2016 Turin FIBA World Olympic Qualifying Tournament, where he averaged 7.0 points and 3.3 rebounds per game.