The Progressive Labour Movement (PLM) was a major political party in Antigua and Barbuda, and until the 2000s, was the only political party to have defeated the Antigua Labour Party (ALP) in an election.
Under the leadership of George Walter and Donald Halstead, the party was emerged from the Antigua Workers Union, which was established in 1967 as a breakaway from the Antigua Labour Party-affiliated Antigua Trades and Labour Union. In the 1971 election, the PLM won 57.7% of the vote and 13 of the 17 seats in the House of Representatives, the first time the Antigua Labour Party (ALM) had lost an election. Walter became Prime Minister.
A series of corruption scandals involving PLM ministers, together with a severe economic downturn caused by the Oil Shock led to a drop in support for the PLM. Nevertheless, it still managed to win a plurality of votes in the 1976 elections. However, despite receiving the most votes, it won only five seats, whilst the ALP won 11.
In the 1980 elections the party lost more support, and won only three seats. A further slump saw them lose their parliamentary representation following the 1984 elections, in which they received only 356 votes.
The PNM did not contest the 1989 elections, and in 1992 it was one of three parties that merged to form the United Progressive Party (UPP).