Kenneth Jason Kerr, known as "Ken", is a Northern Irish loyalist activist. He was a leading figure within the Ulster Defence Association (UDA) and its political wing, the Ulster Loyalist Democratic Party. He was also central to a series of allegations regarding collusion between the British security forces and loyalist paramilitaries.
In his youth Kerr served in the British Army before joining the UDA. He served as Brigadier of the UDA's "Londonderry and North Antrim Brigade", and as such was a member of the movement's Inner Council. In this role he succeeded Andy Robinson, who fled his position in 1986. Like South Belfast brigadier John McMichael, Kerr also became involved in the UDA's political arm, the Ulster Loyalist Democratic Party, and following the killing of McMichael in 1987, Kerr served for a time as chairman of the party. This role was soon filled on a more permanent basis by Ray Smallwoods. Kerr's reign had never been likely to last long as the brigade he commanded was one of the UDA's weakest and he was not personally popular within the movement.
In 1989, the Ulster Loyalist Democratic Party contested the local elections and, despite a very low-key campaign, Kerr was elected as their sole representative in Northern Ireland. He was elected to Derry City Council, representing the loyalist Waterside area. He lost the seat at the 1993 election. Kerr's win was however something of aberration as the success of the Ulster Democratic Party (UDP), as they became known in 1989, was otherwise limited to Belfast and its satellite towns of Lisburn and Newtownabbey.