Terrence James Brennan (born April 3, 1989) is an American professional ice hockey defenseman who is currently playing for HC Ajoie of the National League (NL).

Brennan has been cited as an elite offensive AHL defenseman, scoring at a pace of nearly a point-per-game, a rare feat for a defender.

[3][4] During the 2006–07 season, Brennan scored 16 goals and 25 assists in 68 games, winning the Raymond Lagacé Trophy as the QMJHL defensive rookie of the year.

[5] Brennan was slotted as the 29th best prospect by the National Hockey League's Central Scouting in advance of the 2009 NHL Entry Draft.

Brennan spent two seasons with the Sabres' American Hockey League (AHL) affiliate, the Portland Pirates.

[9] On March 15, 2013, Brennan was traded to the Florida Panthers in exchange for a fifth-round pick in the 2013 NHL Entry Draft.

[15][16] On July 4, 2014, Brennan buoyed by his successful season with the Marlies signed as an unrestricted free agent on a one-year NHL contract with the New York Islanders.

[26] During his fourth year within the Flyers organization with the Lehigh Valley Phantoms in the 2019–20 season, Brennan was unable to match his previous career scoring output, recording just 8 points through 28 games, before suffering an injury.

[30] With Salzburg, Brennan won the league championship, scoring 27 goals and 59 points in 60 games (playoffs included).