Biddy is a given name which may refer to:
People:
- Biddy Anderson (1874–1926), South African cricketer
- Biddy Baxter (born 1933), English television producer
- Biddy Dolan (1881–1950), American Major League Baseball player
- Biddy Early (c. 1798-1874), Irish traditional healer
- Bridget Hodson, British actress
- Carolyn Martin, nicknamed "Biddy", Chancellor of the University of Wisconsin–Madison
- Biddy Mason (1818–1891), African American nurse, entrepreneur, and philanthropist
- Biddy Rockman Napaljarri (born c. 1940), indigenous Australian artist
- Biddy, a member or supporter of the Crozier Center for Women at Kenyon College
Fictional characters:
- Biddy, in the novel Great Expectations by Charles Dickens
- Biddy Byrne, a protagonist in Glenroe, an Irish television drama
- Biddy Mulligan, a character played by Jimmy O'Dea, an Irish actor and comedian
Slang
- Biddy, ("old biddy") a woman, especially an old gossipy or interfering one. Originally a name for an Irish servant girl, ca. 1858, either from the name Bridget, or from the Irish-Gaelic word beadaí, pronounced b'-ad-í, meaning saucy, impudent; a flatterer; an impertinent person; a goose.