Coolbaugh is a surname of German origin, and an Americanized version of Kühlbach. Notable people with the surname include:
Bob Coolbaugh (1939–1985), American football wide receiver Mike Coolbaugh (1972–2007), American baseball player and coach Scott Coolbaugh (born 1966), American baseball player Walter W. Coolbaugh (1918–1942), United States Navy officer William F. Coolbaugh (1821–1877), American politician and banker from Pennsylvania
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