Frank Day

Frank Day may refer to:


 * Frank A. Day (1855–1928), Minnesota legislator
 * Frank Day (artist) (1902–1976), Native American artist
 * Frank Miles Day (1861–1918), Philadelphia-based architect
 * Frank Parker Day (1881–1950), Canadian athlete, academic and author
 * Frank R. Day (1853–1899), entrepreneur and politician in Los Angeles and Monterey, California