Sir Brian George Keith Alleyne (born 28 April 1943) is a Dominican jurist.
He was the son of Keith Alleyne, the onetime attorney general of the Windward Islands and Attorney General of Grenada who was murdered in 1974.
Alleyne served for 16 years in the House of Assembly of Dominica and in various capacities within the Dominican government under Eugenia Charles. He also served as Queens Council and as Attorney General of the Windward Islands.
Beginning in 2005 he served as the Acting Chief Justice of the Eastern Caribbean Supreme Court, stepping down from the position in 2008 to be succeeded as Chief Justice by Hugh Anthony Rawlins. As Chief Justice, he was the supreme judicial officer of the courts of Anguilla, Antigua and Barbuda, the British Virgin Islands, Dominica, Grenada, Montserrat, Saint Kitts and Nevis, Saint Lucia, and Saint Vincent and the Grenadines.
Sir Brian is married to Brenda Alleyne, with whom he has three children. He was knighted in 2007.