Carol Marcel Vadnais (born September 25, 1945 in Montreal, Quebec, Canada) is a retired professional ice hockey defenceman who played seventeen seasons in the National Hockey League from 1966–67 until 1982–83. Vadnais won two Stanley Cups during his career, in 1968 with the Montreal Canadiens and again in 1972 with the Boston Bruins. In 1972, Vadnais was acquired by the Boston Bruins in an attempt to bolster their blueline for a Stanley Cup run. The move paid off, and Vadnais helped the Bruins capture the 1972 Stanley Cup.