Robert Lea MacMillan (born December 3, 1952) is a Canadian former professional ice hockey forward and a former politician who served in the Legislative Assembly of Prince Edward Island.

He helped the Calgary Flames reach the NHL playoff semifinals for the first time in 1981.

[2] He was traded along with Dick Redmond, Yves Bélanger and a second-round selection in the 1979 NHL Entry Draft (23rd overall–Mike Perovich) from the St. Louis Blues to the Atlanta Flames for Phil Myre, Curt Bennett and Barry Gibbs on December 12, 1977.

After two years behind the bench he made a brief comeback to the ice when he dressed for two games with the Charlottetown Islanders in the 1987–88 season and scored four points.

MacMillan served in the Prince Edward Island legislature from 2000–2003, as part of Pat Binns's Progressive Conservative government.