Alexander Bannerman Warburton (April 5, 1852 – January 14, 1929) was a politician, jurist and author, who served as the seventh premier of Prince Edward Island, Canada.

Alexander was born in Summerside, the son of James Warburton, who was a member of the provincial assembly.

Warburton only served in the position for eight months until resigning in June 1898 to accept a judicial appointment.

In 1920, Warburton returned to the bench as a judge on probate court and held that position until his death.

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.