Baron Monkswell, of Monkswell in the County of Devon, is a title in the Peerage of the United Kingdom. It was created in 1885 for the lawyer and Liberal politician Sir Robert Collier. His eldest son, the second Baron, served as Under-Secretary of State for War in 1895 in the Liberal administration of Lord Rosebery. His grandson, the fourth Baron (who succeeded his uncle in the title), disclaimed the peerage on 7 April 1964. He had earlier been a member of the Essex County Council. the title is held by his grandson, the sixth Baron, who succeeded in that year. The artist John Collier was the younger son of the first Baron. His son, Sir Laurence Collier, was British Ambassador to Norway from 1939 to 1950.

Barons Monkswell (1885)

The heir presumptive is the present holder's brother, the Hon. Robert William Gerard Collier (born 1979)