Ruben Bertrand Boumtje-Boumtje (born 20 May 1978) is a Cameroonian professional basketball executive and former player who last served as the assistant general manager of the Delaware Blue Coats of the NBA G League.

He ranks fourth on the Hoyas' all-time blocked shots list with 255, behind Patrick Ewing, Alonzo Mourning and Dikembe Mutombo.

What ended up being his final regular season NBA game took place on December 20, 2003, while the Blazers visited the San Antonio Spurs in a losing effort; Boumtje-Boumtje recorded one foul and one missed field goal in four minutes of playing time.

[5] On January 21, 2004, when he was traded along with guard Jeff McInnis to the Cleveland Cavaliers in exchange for small forward Darius Miles.

[12] He was named Big East Scholar-Athlete of the Year in 2001, an honor often reserved for athletes in non-televised sports, and used the occasion to restate his intention to attend medical school if he were not drafted by the NBA.