The Unite Australia Party (UAP) was a short-lived Australian political party that existed in the late 1980s. In December 1986, Senator John Siddons, former deputy leader of the Australian Democrats, quit the Democrats to form the UAP, arguing that the Democrats under leader Janine Haines had moved too far to the left on key issues and was no longer representative of small 'l' liberal values. Initially composed of disaffected Democrats, the UAP gained a boost when two other minor parties, the Advance Australia Party and the Australia Party agreed to amalgamate with the UAP, raising its national membership to around 5000. The UAP was registered as a political party on 21 January 1987 with Siddons claiming the party would become the new third force of Australian politics.