• Fitter (aircraft), a Soviet attack aircraft
• Fitter (occupation), a person who uses machine tools to make or modify parts
• Comparative of the adjective "fit"

People named Fitter

• Alastair Fitter
  Alastair Fitter
  Alastair Hugh Fitter CBE FRS is a British ecologist at the University of York. He was educated at Oxford and at Liverpool, and came to the Department of Biology in York in 1972. In 2004 he was appointed Pro-Vice-Chancellor, with the Research portfolio...
  
  , British ecologist
• R. S. R. Fitter (1913-2005), British naturalist and author