William "Bill" Moriarty (1890, London, United Kingdom – April 14, 1936) was a Canadian Communist and Right Oppositionist.
He was expelled from the party in 1930 as a supporter of the "Right Opposition", pro-Bukharin, Jay Lovestone current in the Comintern.
[1] He founded the Toronto-based Marxian Educational League which was a branch of Lovestone's Communist Party (Opposition) and the International Communist Opposition.
's delegate at the national Cooperative Commonwealth Federation convention that drafted the Regina Manifesto in 1933.
Moriarty remained a member of Lovestone's international tendency until his death in 1936.