Bolton Meredith Eyres-Monsell, 1st Viscount Monsell, PC (1881-1969) was a British Conservative politician who served as Chief Whip until 1931 and then as First Lord of the Admiralty.

His parents were Lt.Col. Bolton James Alfred Monsell, a soldier and a Chief Constable in the Metropolitan Police, and Mary Beverley, daughter of Sir Edmund Ogle, 6th Bt. Bolton Monsell took the name Eyres upon his marriage to Caroline Eyres.

Eyres-Monsell served as Member of Parliament for the Evesham Division of Worcestershire from 1910 to 1935. He became First Lord of the Admiralty in 1931. He was created Viscount Monsell in 1935, retaining his office in government until 1936.

Lord Monsell's daughter, the Hon. Joan Eyres-Monsell, was married for the second time in 1968 to Patrick Leigh Fermor, the traveller and author.