Colin O'Brien (born 17 April 1984) is a former Irish professional tennis player.

He was born in Dublin, Ireland.

[1] O'Brien mainly played on the ITF Men's Circuit[1] and also competed for the Ireland Davis Cup team where he held a 4–5 record.

[2] He retired at the end of the 2013 season.

Wins (0) Runner-up (3) Wins (9) Runner-up (15)