Bidder is a surname. It may refer to:
Anna McClean Bidder (1903–2001), British zoologist Birgit Bidder (born 1986), Swedish musician Friedrich Bidder (1810–1894), German physiologist and anatomist George Parker Bidder (marine biologist) (1863–1954), British marine biologist George Parker Bidder (engineer) (1806–1878), British engineer George Parker Bidder Jr. (1836–1896), British lawyer Joyce Bidder (1906–1999), British sculptor Marion Bidder (1862–1932), British physiologist