Frederick or Fred Warner may refer to:

• Frederick Warner (diplomat) (1918–1995), British diplomat and politician
• Frederick Warner (engineer) (1910–2010), British chemical engineer
• Frederick Warner (politician) (1875–1952), Australian politician
• Fred M. Warner (1865–1923), Governor of the U.S. state of Michigan
• Fred Warner (baseball) (1855–1886), American baseball player
• Fred Warner (American football), American football player
• Fred L. Warner (1877–1942), politician in the Michigan House of Representatives

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