The 1966 All-Ireland Junior Football Championship was the 45th staging of the All-Ireland Junior Championship since its establishment by the Gaelic Athletic Association in 1912.

Galway entered the championship as defending champions, however, they were beaten by Down in the All-Ireland semi-final.^[2]

The All-Ireland final was played on 23 October 1966 at the Gaelic Grounds in Limerick, between London and Cork, in what was their second ever meeting in the final. London won the match by 1–06 to 0–08 to claim their second championship title overall and a first tile in 28 years.^[3][4]

Louth v Kildare

10 August 1966[5][6][7][8] Final (After Extra-time)	Louth	3-14 - 3-12	Kildare	Croke Park
	Lynch (1-6), Nugent (1-2), Duff (1-2), Judge (0-3), McCarthy (0-1)		J. Kane (1-9), Gleeson (1-2), Dillon (1-0), Conway (0-1)	Referee: K. Kenworthy (Dublin)

Cork v Louth

14 August 1966[9]	Cork	0-10 - 0-06	Louth	Cork Athletic Grounds
	T. Bourke (0-5), Sheehan (0-1), Kelleher (0-1), White (0-1), Evans (0-1), Roche (0-1)		Lynch (0-3), McCarthy (0-2), Nugent (0-1)

Down v Galway

14 August 1966

Down

0-10 - 1-04

Galway

Páirc Esler

Cork v Down

11 September 1966 Home final

Cork

2-12 - 0-10

Down

Croke Park

London v Cork

23 October 1966[10] Final	London	1-06 - 0-08	Cork	Gaelic Grounds
				Referee: T. Cunningham (Galway)

• Leinster Junior Football Championship
• All-Ireland Junior Football Championship