Bagnold may refer to:
- Enid Bagnold (1889–1981), author and playwright
- Millicent Bagnold, a character in the Harry Potter books
- Ralph Bagnold (1896–1990), British Army Officer
- Bagnold number, a representation of the ratio of stresses within granular flows
- Bagnold formula, a calculation relating the amount of a wind-blown fluid to wind speed
- Bagnold Dunes, an extraterrestrial dune field