Rumen Trifonov (; born 21 February 1985) is a former Bulgarian professional footballer who played as a defender. He is currently working as a youth coach for CSKA Sofia.
Career
Trifonov earned his first call-up to the Bulgaria national side in March 2011 for the Euro 2012 qualifier against Switzerland and the friendly match versus Cyprus, but did not feature in these games.
On 22 February 2018, Trifonov joined Third League club Spartak Pleven. In June 2018, he moved to Second League side Montana.
Later career
Missing the most of the 2019-20 season due to an injury in the autumn 2019, 35-year old Trifonov decided to retire at the end of the year.
In February 2020 he returned to PFC CSKA Sofia as a youth coach, where he became head coach of the players from 2004 and would also help the U17 team. Beside that, he also signed for OFK Kostinbrod in March 2020.