Brian O'Neill (born June 1, 1988) is an American professional ice hockey forward for EV Zug of the National League (NL).

Undrafted, O'Neill played collegiate hockey with Yale University of the ECAC before signing a one-year entry-level contract with the Los Angeles Kings at the conclusion of his senior year on March 15, 2012.

In the post-season, O'Neill's continued his offensive pace in recording 10 goals and 20 points to help the Monarchs dominate the league and capture the Calder Cup in their final season in the AHL.

O'Neill was an offensive catalyst for six years in Jokerit before the club withdrew from the KHL during the 2021–22 season due to the Russian invasion of Ukraine.

As a free agent, O'Neill opted to continue his career abroad, agreeing to a two-year contract with Swiss club EV Zug of the NL on May 6, 2022.