Albert G. Lawrence (1836 - 1887) was an American Ambassador to Costa Rica. He served as an officer with the Union Army during the American Civil War. He was commissioned as a 1st lieutenant with the 54th New York Volunteer Infantry on December 5, 1862. He resigned his commission on March 20, 1863. He was commissioned as a captain in the 2nd United States Colored Cavalry Regiment on February 12, 1864. He saw action at Fort Fisher, North Carolina in early 1865 and received brevet promotions to the rank of brigadier general. He resigned from the Army on January 10, 1866.