Alexander D. Robertson (March 5, 1849 - January 2, 1921[1]) was a farmer, merchant and political figure in Prince Edward Island. He represented 1st Kings in the Legislative Assembly of Prince Edward Island from 1891 to 1897 as a Liberal member.
He was born in West River, East Point, Prince Edward Island, the son of James Robertson and Mary Jarvis,[1] of Scottish descent, and was educated in that district and in Charlottetown. Robertson married Bertha Lydia Fraser in 1887.
He was first elected to the provincial assembly in an 1891 by-election held after John McLean was elected to the House of Commons. Robertson was defeated when he ran for reelection in 1897.[1]