John "Jackie" McDonald is a Northern Irish loyalist and the incumbent Ulster Defence Association (UDA) brigadier for South Belfast, having been promoted to the rank by former UDA commander Andy Tyrie in 1988, following John McMichael's killing by the Provisional IRA in December 1987. He is also a member of the organisation's Inner Council and the spokesman for the Ulster Political Research Group (UPRG), the UDA's political advisory body.

The Ulster Defence Association (UDA) is an Ulster loyalist paramilitary group in Northern Ireland. It was formed in September 1971 as an umbrella group for various loyalist groups and undertook an armed campaign of almost 24 years as one of the participants of the Troubles. Its declared goal was to defend Ulster Protestant loyalist areas and to combat Irish republicanism, particularly the Provisional Irish Republican Army (IRA). In the 1970s, uniformed UDA members openly patrolled these areas armed with batons and held large marches and rallies. Within the UDA was a group tasked with launching paramilitary attacks that used the cover name Ulster Freedom Fighters (UFF) so that the UDA would not be outlawed. The British government proscribed the UFF as a terrorist group in November 1973, but the UDA itself was not proscribed until August 1992.