Biddy or Biddie is a given name which may refer to:

• 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
• Biddy Hodson, stage name of Bridget Hodson, British actress
• Gertrude Macdonald or Biddy Jamieson (1871–1952), English painter
• Carolyn Martin (born 1951), nicknamed "Biddy", president of Amherst College
• Biddy Mason (1818–1891), African American nurse, entrepreneur, and philanthropist
• Biddy Rockman Napaljarri (born c. 1940), indigenous Australian artist
• Biddy O'Sullivan, Irish former camogie player
• Biddy White Lennon (1946–2017), Irish actress and food writer

• Biddy, in the novel Great Expectations by Charles Dickens
• Biddy Paget, in the crime novel Mystery Mile by Margery Allingham
• Biddy Byrne, a protagonist in Glenroe, an Irish television drama
• Biddie Cloom, in Here Come the Brides, an American television series
• Biddy Mulligan, played by Jimmy O'Dea, an Irish actor and comedian
• Biddy, in the film Biddy (1983) by Christine Edzard

• Biddy Basketball a type of basketball games played by youth

• Bridget (given name), of which Biddy is a contraction
• Biddie (steamboat) – see Steamboats on Lake Coeur d'Alene
• Acaena novae-zelandiae or biddy-biddy, an ornamental plant
• Silver biddy, a fish