Peter O'Reilly may refer to:
Peter O'Reilly (civil servant) (1827–1905), settler and official in the Colony of British Columbia Peter Joseph O'Reilly (1850–1923), Irish-born Catholic bishop in the United States Peter O'Reilly (hurler) (1902–1940), Irish hurler Peter O'Reilly (Gaelic footballer) (1916–1994), Irish Gaelic football manager, coach and player Peter O'Reilly (cricketer) (born 1964), Irish sports journalist and former cricketer