Jimmy O'Brien (born 27 November 1996) is an Irish rugby union player who plays as a back with Leinster Rugby. O'Brien was born in Eadestown in County Kildare, Ireland. He played in his school rugby with Newbridge College. Although he played fly-half at school, he moved to inside centre with the Leinster academy. His strengths in attack include a good kicking game, footwork, and passing, while in defence despite his lack of size he has a physical approach.