Hon. Capt. Michael Langhorne Astor (10 April 1916 - 28 February 1980) was a British Conservative Party politician and fourth child of Waldorf Astor, 2nd Viscount Astor and Nancy Witcher Langhorne, both Members of Parliament.

Astor was educated at Eton College. He gained the rank of Captain serving in the Royal Artillery (Territorial Army).

He married, firstly, Barbara McNeill in 1942, with whom he had four children. They were divorced in 1961. He then married Patricia Clifford in 1961, divorcing in 1968. He married for the third time Judith Innes in 1970, with whom he had a daughter in 1971.

Michael Astor was elected as Conservative Member of Parliament for Surrey East in the 1945 General Election. He kept his seat in the 1950 election but did not stand in 1951.

He wrote the books Tribal Feeling - his memoirs, published in 1963, and a novel Brand, published in 1968.