Peter Aloysius McNeil (3 October 1917 – 4 August 1989) was a Canadian architect and politician.
Born in Dominion, Nova Scotia, the eighth son and tenth child of a coal miner, McNeil worked as a farm labourer and carpenter's helper until the Second World War, joining the Royal Canadian Navy and attaining the rank of Shipwright 3rd Class.
After the death of 5th Queens MLA Elmer Blanchard, McNeil became the Liberal candidate for the riding in the by-election of 23 November 1970; a race he would win.
He continued to practice as an architect, designing schools, seniors' complexes, churches, and recreational centres.
He was the first president of the Prince Edward Island Architect's Association, and a fellow of the Institute of Professional Designers.