Robert John Hadley (born 22 October 1951) is a former Welsh cricketer.
Hadley was a right-handed batsman who bowled left-arm fast-medium.
He was born at Neath, Glamorgan.
While studying at St John's College, Cambridge, Hadley made his first-class debut for Cambridge University against Warwickshire at Fenner's in 1971.
He made six further first-class appearances in that season for the university.
In that same season he also made two first-class appearances for Glamorgan, against Leicestershire and Somerset in the County Championship.
Against Leicestershire he took his maiden five wicket haul, with figures of 5/32 during Leicestershire's first-innings.
These were to be his only first-class appearances for Glamorgan.
He continued to play first-class cricket for Cambridge University in 1972 and 1973, making seventeen further first-class appearances, the last of which came against Oxford University in The University Match at Lord's.
In total he made 24 first-class appearances for the university, taking 47 wickets at an average of 30.17, with best figures of 5/31.
These figures were one of two five wicket hauls he took for the university and came against Sussex in 1972.
He also made two first-class appearances for a combined Oxford and Cambridge Universities team, against the touring Australians in 1972 and the touring New Zealanders in 1973.Hadley also appeared in three List A matches for Cambridge University in the 1972 Benson & Hedges Cup, playing against Warwickshire, Worcestershire, and Northamptonshire in the group stages of the competition.
He had little success in these matches, taking just a single wicket.He became a doctor.