Thomas Timothy Manastersky (March 7, 1929 – March 11, 2012) was a Canadian athlete. He played Canadian football and ice hockey. He played in the Canadian Football League as a halfback with the Montreal Alouettes and Saskatchewan Roughriders, the youngest player in CFL history. He won the 1949 Grey Cup with the Alouettes. He also played 6 games in the National Hockey League with the Montreal Canadiens during the 1950–51 season.

Turning professional right out of high school, Manastersky played 6 seasons and 68 regular season games for his hometown Montreal Alouettes. The high point of his football career was being part of the Alouettes' first Grey Cup in 1949. He finished his career playing for the Saskatchewan Roughriders in 1954.^[1]

He was a two-sport professional athlete. He had played hockey for the Montreal Royals, Cincinnati Mohawks, and Victoria Cougars in the minor leagues, but in the 1950–51 NHL season he got called up. A big defenceman, he played six games for the Montreal Canadiens, recording 11 penalty minutes.

He died on March 11, 2012, following a lengthy illness.^[2]