John James O'Reilly (7 October 1896 - 18 March 1942) was an Irish Gaelic footballer.
His championship career at senior level with the Dublin county team spanned eleven seasons from 1919 until 1929.
He was educated locally and later worked as a van boy before joining the Irish army.
O'Reilly first played competitive football during a golden age for the O'Tooles club.
Success at club level saw O'Reilly join the Dublin senior team and he made his debut during the 1918 championship.