Gary Kevin Dillon (born February 28, 1959 in Toronto, Ontario) is a retired professional ice hockey centre who played 13 games in the National Hockey League with the Colorado Rockies. His brother, Wayne Dillon, also played in the NHL.
In 1974-75 Dillon played Junior "B" hockey for the Markham Waxers. He then played major junior for the Toronto Marlboros from 1975 to 1979, scoring 375 points in four seasons. The Colorado Rockies chose him 85th overall in the 1979 NHL Entry Draft.
Dillon turned pro in 1979-80 with the Fort Worth Texans, scoring 30 goals. The next season he played in 13 games for the Rockies, scoring a goal and an assist, while playing most of the season for the Texans. He signed as a free agent with the Quebec Nordiques in 1981 and played the 1981-82 season for the Fredericton Express. At the end of the season, he retired.