The Trio Grande was a line of professional ice hockey forwards who played together for the New York Islanders from the late 1970s through the early 1980s. The line consisted of Hall of Famers Bryan Trottier at center, Clark Gillies at left wing and Mike Bossy at right wing.
All three members of the Trio Grande were highly regarded as amateur players. The Islanders drafted Gillies 4th overall and Trottier 22nd overall in the 1974 NHL Entry Draft, and drafted Bossy 15th overall in the 1977 NHL Entry Draft. Gillies made the Islanders roster that season, while Trottier spent another year in the WCHL before joining the Islanders in 1975–76, winning the Calder Trophy as Rookie of the Year and participating in the NHL All-Star Game.
The Trio Grande emerged in 1977. Bossy made the Islanders Coach Al Arbour break up his former top line of Trottier, Gillies and Billy Harris in training camp, inserting Bossy, as a rookie. The results were immediate, as Trottier emerged as a points leader, Bossy emerged as a league's leading goal scorer, while Gillies, the team captain and a larger presence than Trottier and Bossy, served as an aggressor, as well as a scorer. Bossy won the Calder Trophy that season. Gillies, at the time 23, was the oldest of the three.