Frank Duncan may refer to:
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Frank Duncan (pitcher) (1920–1999), American baseball player in the Negro leagues from 1941 to 1945
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Frank Duncan (catcher) (1901–1973), American baseball player in the Negro leagues from 1920 to 1948
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Frank Duncan (outfielder) (1888–1958), Negro leagues outfielder and manager
{{human name disambiguation, Duncan, Frank