Reginald "Reg" James Alexander MacDonald (May 29, 1934 - January 13, 2018) was a political figure in New Brunswick, Canada. He represented Bay du Vin and then Southwest Miramichi in the Legislative Assembly of New Brunswick from 1978 to 1982 and from 1987 to 1999 as a Liberal member. MacDonald died on January 13, 2018 at the Saint John Regional Hospital in Saint John, New Brunswick at the age of 83.