Ole Olsen Lian (10 November 1868 – 20 February 1925) was a Norwegian trade unionist and politician for the Labour Party. He was born in Tønsberg. In April 1891 in Kristiania he married Elida Josefine Karoline Ellingsen. He settled in Kristiania in 1889 to work as a typographer after a period at sea. He became active in the Norwegian Central Union of Book Printers, and became chairman in 1903. In 1905 he became deputy chairman of the Norwegian Confederation of Trade Unions, advancing to chairman in 1906. He served as such until his death in 1925.