The Dr Lagan Cup was inter-county Gaelic football

Gaelic football

Gaelic football , commonly referred to as "football" or "Gaelic", or "Gah" is a form of football played mainly in Ireland...

 competition in the province of Ulster

Ulster

Ulster is one of the four provinces of Ireland, located in the north of the island. In ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for administrative and judicial...

. The competition was discontinued in 1967 when Donegal

Donegal GAA

The Donegal County Board of the Gaelic Athletic Association or Donegal GAA is one of the 32 county boards of the GAA in Ireland, and is responsible for Gaelic games in County Donegal. The county board is also responsible for the Donegal inter-county teams.Gaelic football is strongest in the...

 won the competition. The Lagan Cup was the trophy for a Senior Football League limited to five Ulster counties at a time unlike the Dr McKenna Cup

Dr McKenna Cup

The Dr McKenna cup is a gaelic football competition played between counties and universities in the province of Ulster. It is the secondary gaelic football competition based in Ulster behind the Ulster Senior Football Championship, and the fourth most important inter-county competition in which...

 which was a knockout competition which included all nine of Ulster's counties.

Top winners

	Team	Winner	Winning Years
1	Down Down GAA The Down County Board of the Gaelic Athletic Association or Down GAA is one of the 32 county boards of the GAA in Ireland, and is responsible for Gaelic games in County Down...	6	1949, 1960, 1961, 1962, 1963, 1964
2	Derry Derry GAA The Derry County Board of the Gaelic Athletic Association or Derry GAA is one of the 32 county boards of the GAA in Ireland. It is responsible for Gaelic games in the GAA county of Derry, which covers virtually the same territory as the former administrative county of Londonderry...	5	1945, 1947, 1950, 1953, 1959,
3	Donegal Donegal GAA The Donegal County Board of the Gaelic Athletic Association or Donegal GAA is one of the 32 county boards of the GAA in Ireland, and is responsible for Gaelic games in County Donegal. The county board is also responsible for the Donegal inter-county teams.Gaelic football is strongest in the...	4	1952, 1965, 1966, 1967
4	Antrim Antrim GAA The Antrim County Board of the Gaelic Athletic Association or Antrim GAA is one of the 32 county boards of the GAA in Ireland, and is responsible for Gaelic games in County Antrim. The county board is also responsible for the Antrim inter-county teams...	3	1944, 1946, 1948
	Tyrone Tyrone GAA The Tyrone County Board of the Gaelic Athletic Association or Tyrone GAA is one of the 32 county boards of the GAA in Ireland, and is responsible for Gaelic games in County Tyrone. The county board is also responsible for the Tyrone inter-county teams....	3	1943, 1957, 1958
	Armagh Armagh GAA The Armagh County Board of the Gaelic Athletic Association or Armagh GAA is one of the 32 county boards of the GAA in Ireland, and is responsible for Gaelic games in County Armagh...	3	1954, 1955, 1956
7	Monaghan Monaghan GAA The Monaghan County Board of the Gaelic Athletic Association or Monaghan GAA is one of the 32 county boards of the GAA in Ireland, and is responsible for Gaelic games in County Monaghan and the Monaghan inter-county football and hurling teams. Separate county boards are responsible for the...	1	1951