Gwynfor Matthews Prosser (born 27 April 1943) is a British politician and engineer who served as Member of Parliament (MP) for Dover from 1997 to 2010.

[1] He was educated at Dunvant Secondary Modern School and gained a National Diploma in Mechanical Engineering from Swansea Technical College.

He became as a senior engineer in the 1970s, working for BR Shipping, John Kincaid of Greenock, Aramco in Saudi Arabia, and Anscar.

During his engineering career, he served on the executive of the National Union of Marine, Aviation and Shipping Transport Officers.

He had unsuccessfully contested the seat at the 1992 general election, but substantially reduced Shaw's majority to less than 900 votes.