John Muldoon (born 30 November 1982) is an Irish rugby union coach and former player.
He is currently the defence coach for the Bristol Bears.
During his playing career, Muldoon played in the back row, primarily as a number 8 but also at blindside flanker.
He spent his entire professional career with Irish provincial team Connacht and represented Ireland at test level.
Muldoon holds the record for appearances for Connacht, is also the most-capped player in the Pro14.
Before becoming a professional rugby player, Muldoon played hurling with Portumna.
He won an inter-county All-Ireland minor medal in 2000 playing for Galway against Cork.