Marie Carmichael Stopes (Edinburgh, 15 October 1880 – Dorking, 2 October 1958) was a British palaeobotanist, author and campaigner for birth control.

Stopes' newsletter Birth Control News, her book Married Love, and her organisation Marie Stopes International, were hugely important in Britain and throughout the British Empire. She was the founder of British family planning, and fought many battles in print with those whose opinions differed from hers.