Terence Joseph James O'Reilly (born June 7, 1951) is a Canadian former professional ice hockey right winger.

O'Reilly spent his entire career in Boston, serving as the captain of the Bruins during the 1983–84 and 1984–85 seasons before his retirement.

As of January 1, 2022, O'Reilly was ranked 20th in career goals scored by a Boston Bruin in regular-season play.

In the infamous December 23, 1979, incident at Madison Square Garden, during a post-game scrum, a New York Rangers fan rolled up a program tightly and smacked Stan Jonathan in the face drawing blood, then stole his stick and wielded it like a weapon.

[3] He became the permanent head coach of the Bruins during the 1986–87 NHL season[4][5] and kept his job until 1989, when he left to care for, and spend more time with his son, Evan, who was seriously ill with liver disease.

O'Reilly has stated his favorite player who plays for the Bruins is Milan Lucic, also born on June 7.