Joseph William (Willie) Comeau (March 12, 1876 – January 11, 1966) was an educator and political figure in Nova Scotia, Canada. He represented Digby County in the Nova Scotia House of Assembly from 1907 to 1917, from 1920 to 1925 and from 1928 to 1948 as a Liberal member. Comeau sat for Clare division in the Senate of Canada from 1948 to 1966.
He was born in Comeauville, Nova Scotia, the son of Louis Comeau and Catherine Bourneuf, and was educated at the Collège Sainte-Anne.
Comeau served as a minister without portfolio in the province's Executive Council from 1911 to 1917, from 1921 to 1925 and from 1933 to 1948. He was a member of the Nova Scotia Legislative Council from 1925 to 1928. Comeau resigned his seat in the provincial assembly in 1917 to run unsuccessfully for a seat in the House of Commons.
He died in office at the age of 89.
Comeau was married twice: first to Grace Sheehan and then, after her death, to Zoé Doucet.
His grandson Robert Thibault later served in the House of Commons.