Thomas P. O'Reilly (6 August 1915 – 12 February 1995) was an Irish Gaelic footballer, politician and farmer from County Cavan.
His father was John O'Reilly, who played as goalkeeper on the Cavan county team and his mother was Sarah Anne.
O'Reilly played for Cornafean and the Cavan county team from the early 1930s until the mid-1940s, and was acclaimed as one of the country's greatest midfielders for much of that period.
He won a total of nine Cavan Senior Football Championship medals and captained Cornafean on seven of those occasions.
He captained the county side from 1937 to 1945 and was still on the Cavan panel when they won the famous 1947 All-Ireland Senior Football Championship Final at the Polo Grounds in New York.