Alfred (Harry) Renton Bridges (1901 July 28-1990 March 30) was an Australian-born seaman and longshoremen and prominent U.S. labor leader, serving as head of the International Longshoremen's and Warehousemen's Union (ILWU, now International Longshore and Warehouse Union) for forty years (1937-1977).

Born in Melbourne, Australia in 1901, Bridges left home to work as a seaman at age 16. In 1920, Bridges moved to San Francisco and worked as a seaman along the Pacific coast. He briefly joined the Industrial Workers of the World (IWW) in 1921. In 1922, Bridges took work as a longshoreman in San Francisco. The following year, Bridges joined the company union, called the "Blue Book."

By the end of the 1920s, Bridges was increasingly involved in labor actions. He helped lead a failed vote to affiliate the Blue Book with the International Longshoremen's Association (ILA). The ILA, emboldened by the Industrial Recovery Act, set out to organize the waterfront again in 1933. Bridges helped to lead these efforts to form ILA Local 38-79, organizing with a slate of militants dubbed the "Albion Hall group."

In 1934, Bridges played a leading role in the Waterfront and then General Strike of 1934. He was then elected President of ILA Local 38-79, going on to become head of the ILA's Pacific District in 1936. In 1937, he led most ILA locals on the Pacific Coast to found the ILWU, which quickly affiliated with the growing Congress of Industrial Organizations (CIO).

Bridges remained head of the ILWU for forty years, seeing the union through major strikes in 1936-1937, 1948, and 1971-1972. He also played a key role in negotiating the Mechanization and Modernization Agreement of 1960 (M and M), which set the terms for containerization in western ports.

Bridges' militancy and sometime association with communists earned him accusations of Communist Party of the United States (CPUSA) membership. This accusation, in turn, fuelled twenty years of attempts by federal officials and politicians to deport Bridges. A 1939 Immigration and Naturalization Service (INS) hearing charged Bridges with being a current member of the CPUSA. A 1941 Smith Act hearing then charged Bridges with having previously been affiliated with the CPUSA. In 1949, a federal grand jury brought charges against Bridges, as well as Henry Schmidt and J.R. Robertson, accusing them of committing perjury during Bridges's naturalization hearing by denying he was a communist. In 1954, federal attorneys launched a civil suit to denaturalize Bridges. Bridges was never deported and ultimately retained his citizenship.

Harry Bridges married three times. He married Agnes Brown in 1934. They divorced in 1945. Bridges then married Nancy Fenton Berdicio, in 1946. They divorced in 1955. Bridges third marriage in December 1958 was to Noriko (Nikki) Sawada, a Japanese-American writer and activist. They remained married until Bridges' death in 1990.

Bridges was also the father of four children: Katherine (Kathy), Robert (Rob), Julie, and Betty Jacqueline (Jackie).