Sir Nicholas Cosmo Bonsor, 4th Baronet (born 9 December 1942) is a British Conservative politician.

Bonsor was Member of Parliament for Nantwich from 1979 to 1983, then for Upminster from 1983 until he lost the seat to Labour's Keith Darvill in 1997. He was Minister for Foreign and Commonwealth Affairs from 1995 to 1997 and practises as a barrister in London.

He lives in Leighton Buzzard in Bedfordshire.