|Date of birth||12 May 1936|
|Place of birth||Larkhall, Scotland|
|* Senior club appearances and goals counted for the domestic league only|
He managed Hamilton during his first spell as a player there. After retiring as a player, Lamont managed East Stirlingshire. Lamont enjoyed some success with the club, guiding them to promotion in 1979–80 and a place in the quarter-finals of the 1980–81 Scottish Cup. He then managed Dumbarton and guided them to near the top of the Scottish First Division in the 1983–84 season, but left the club in February 1984 to manage Falkirk.
Lamont guided Falkirk to promotion to the Scottish Premier Division in 1985–86, but then left the club in February 1987 because he believed that the club needed a full-time manager to compete in the Premier Division and he was unwilling to relinquish his other job. After leaving Falkirk, Lamont then managed Partick Thistle. He returned to Falkirk in November 1989 on a part-time basis, but was sacked a few months later after the club was taken over by new owners. Lamont then returned to Dumbarton. In season 1991-92 Billy successfully led Dumbarton to the First Division by winning the Scottish Second Division. and later managed Alloa Athletic.Finally retiring from the game and now residing in Spain.