The Irish Anti-Partition League (APL) was a political organisation based in Northern Ireland which campaigned for a united Ireland from 1945 to 1958. The organisation aimed to unite Irish nationalists, filling the void left by nationalist groups that had become inactive in the decade prior. At its peak, the League had around 3,500 members.[1] There was significant internal debate about whether candidates should participate in the British Parliament. In the mid-1950s, most abstentionists had left the organisation. Dwindling membership meant that by 1956, no candidates were nominated for committee elections. The organisation remained inactive until 1958, when a final meeting was held to distribute remaining funds. The League was succeeded by National Unity in 1959.