Fiona Campbell or Fionna Campbell may refer to:
People Fiona Campbell (cricketer) (born 1981), Scottish cricketer Fiona Campbell (alpine skier) (1929–2005), British alpine skier Fiona Campbell (mezzo-soprano), Australian opera singer Fiona Kumari Campbell (born 1963), Australian disability studies researcher and theorist Fiona Campbell-Walter (born 1932), British model
Other uses Fionna Campbell, fictional character in the Adventure Time franchise "Fionna Campbell", television episode of the animated series Adventure Time: Fionna and Cake