Pierre-Luc O'Brien (July 22, 1982 in Nicolet, Quebec) is a Canadian forward playing for the South Carolina Stingrays in the ECHL.
He played junior hockey for the Cowichan Valley Capitals from 2001 to 2003 and the played four years for Sacred Heart College in the NCAA.
Undrafted by any NHL team, O'Brien turned pro in 2007-08 with the Stingrays. He has spent most of his career with them.