F scale may refer to:
F-scale (personality test), a personality test that attempts to quantify authoritarian tendencies Fujita scale, a system of rating of a tornado's intensity by its impact on structures and vegetation F scale (modelling), a 1:20.3 scaled gauge track used with model trains F Scale, a validity scale of the Minnesota Multiphasic Personality Inventory the F major scale.
See also F-number (disambiguation) F-ratio (disambiguation)