Brendan Adam Mathew Gallagher (born May 6, 1992) is an alternate captain for the Montreal Canadiens of the National Hockey League (NHL). He was selected by the Canadiens in the fifth round, 147th overall, of the 2010 NHL Entry Draft.
During his four-year junior career, Gallagher received Western Hockey League (WHL) West First All-Star Team honours (2010–11) and became the Vancouver Giants' all-time leading goal- and point-scorer. Internationally, he won a bronze medal with Canada at the 2012 IIHF U20 Championships.
Playing in the South Delta Minor Hockey Association, Gallagher was selected in the ninth round of the 2007 WHL Bantam Draft by the Vancouver Giants. He joined the Giants for his WHL rookie season in 2008–09. Gallagher scored his first WHL goal against goaltender Kevin Armstrong on September 27, 2008, in a 7–3 win over the Prince George Cougars. After finishing the regular season with 10 goals and 31 points over 52 games, he added three points (one goal, two assists) in 16 post-season contests, as the Giants were eliminated in the semifinals by the Kelowna Rockets. The following season, Gallagher improved to 81 points over 72 games, ranking second among Giants players, behind Craig Cunningham, while his 41 goals were a team high. Gallagher's efforts continued in the post-season, helping the Giants to the semifinals for his second consecutive year with the club. He registered 21 points (11 goals and 10 assists) in 16 games, second in team-scoring and fifth in the league, as Vancouver was eliminated by the Tri-City Americans.