Alexander Bannerman Warburton (April 5, 1852 - January 14, 1929) was a Prince Edward Island politician, jurist and author. Warburton was first elected to the province's legislative assembly in 1893 as a Liberal and was re-elected in 1897. He became Premier on October 27, 1897 when his predecessor resigned to move to British Columbia. Warburton only served in the position for eight months until resigning in June 1898 to accept a judicial appointment. In 1908 he was elected to the Canadian House of Commons as a Liberal MP but lost his seat in the 1911 federal election that defeated the Laurier Liberals. He attempted to return to the House but was again defeated in the 1917 election . In 1920, Warburton returned to the bench as a judge on probate court and held that position until his death.

Warburton wrote two books on the history of the island, Prince Edward Island, Past and Present in 1905 and A History of Prince Edward Island which was published posthumusly in 1923. Prior to entering politics, Warburton started a movement to beautify Charlottetown which resulting in the planting of more than 800 trees along main thoroughfares and in public squares many of which stand to this day.