John O'Hara (1905–1970) was an American writer of Appointment in Samarra, Butterfield 8, and many short stories.
John O'Hara may also refer to:
Law and politics John J. O'Hara (1885–1954), Michigan politician Sir John Ailbe O'Hara (born 1958), Northern Ireland judge John O'Hara (Brooklyn politician) (born 1961), American lawyer
Sports Jack O'Hara (John James O'Hara, 1866–1931), Australian rules footballer John O'Hara (wrestler) (1913–1983), Australian wrestler John O'Hara (American football) (1944–1992), American football coach John O'Hara (soccer, born 1959), American soccer defender John O'Hara (footballer, born 1981), Irish soccer goalkeeper
Others John Bernard O'Hara (1862–1927), Australian poet John Myers O'Hara (1870–1944), American poet John Francis O'Hara (1888–1960), American cardinal John Joseph O'Hara (born 1946), American Roman Catholic prelate
Other uses O'Hara's Playboys, a.k.a. "John O'Hara and His Playboys", British music group