The 1919–20 PCHA season was the ninth season of the professional men's ice hockey Pacific Coast Hockey Association (PCHA) league. Season play ran from December 26, 1919, to March 10, 1920. The season was enlarged to 22 games per team. The Seattle Metropolitans club finished first during the regular season and then won the playoff with the Vancouver Millionaires to take the PCHA championship. The Mets then played in the 1920 Stanley Cup Finals against the National Hockey League (NHL) champion Ottawa Senators. The Senators won the best-of-five series three games to two.

The Pacific Coast Hockey Association (PCHA) was a professional ice hockey league in western Canada and the western United States, which operated from 1911 to 1924 when it then merged with the Western Canada Hockey League (WCHL). The PCHA was considered to be a major league of ice hockey and was important in the development of the sport of professional ice hockey through its innovations.