George Parker Bidder was a British marine biologist who primarily studied sponges. He was the President of the Marine Biological Association (MBA) from 1939 to 1945.

The Marine Biological Association of the United Kingdom (MBA) is a learned society with a scientific laboratory that undertakes research in marine biology. The organisation was founded in 1884 and has been based in Plymouth since the Citadel Hill Laboratory was opened on 30 June 1888.