Michael S. Sullivan (April 2, 1876 – May 22, 1929) was a civil engineer, surveyor and politician in Newfoundland.

The son of Patrick Sullivan and Selma Brown, he was born in Presque on April 2, 1876, and was educated at Saint Bonaventure's College.

[1] He worked for the Reid Newfoundland Company until 1914 when he went into business on his own as a pulp wood agent.

Sullivan was defeated by a People's Party candidate when he ran for reelection in 1909.

He was reelection in 1919 and served in the Newfoundland cabinet as a minister without portfolio from 1924 to 1928 and as Colonial Secretary in 1928.