William J. Sinon

William J. Sinon (1854 – December 8, 1898) was a Canadian American carpenter and politician who served two non-consecutive terms in the California State Assembly, from 1880 to 1881 and from 1883 to 1885. He was an officer in the Workingmen's Party of California, and during his first term denounced fellow WPC assemblyman Stephen J. Garibaldi as the "Judas Iscariot of the party" for voting against them on a revenue bill. He was later active in the Democratic Party, campaigning on behalf of Winfield Scott Hancock during the 1880 presidential election.

During his second term, Sinon authored legislation establishing the California Bureau of Labor Statistics, the ninth such agency in the country. Governor George Stoneman appointed former state senator John S. Enos, another member of the Workingmen's Party, as its first head, drawing criticism that the office had been created specifically for his benefit.