Theo Foley (born 2 April 1937) is an Irish former footballer and football manager.
During his footballing career, he played as a defender for Home Farm F.C., before moving to England to pursue a career beginning with Burnley F.C., then moving to Exeter City F.C., Northampton Town F.C., then Charlton Athletic F.C..
He also appeared nine times for the Republic of Ireland.
It was at Charlton that Theo began his managerial career, before moving on to local non-League team Dulwich Hamlet, and then on to Queens Park Rangers.
Perhaps his biggest success was as assistant to George Graham at Millwall, where the two led Millwall from the brink of the Fourth Division to the Second also winning the Football League Group Trophy, and then at Arsenal, where the pair won a League Cup in 1987 and a First Division title in 1989. He left Arsenal in 1990 to manage Northampton Town, but left in 1992 when the club went into administration.
Theo, now retired, has kept his links with Charlton Athletic and is a popular match day hospitality host.