'KG' was the designation of Allied convoys (together with a numerical suffix) plying the route from Key West, Florida, to Guantánamo, Cuba, and as reciprocals of the 'GK' series (September 1942/May 1945).

The first of the 168 such 'Key West to Guantánamo' convoys was KG.600 of 1/4 September 1942 with the 3,638-ton British Baron Cawdor, 7,176-ton US Benjamin Contee, 5,105-ton US Cape St George, 5,617-ton US Colabee, 5,122-ton British Comedian, 5,149-ton British Comliebank, 6,409-ton Norwegian Glittre, 5,888-ton British Gorjistan, 7,191-ton US John Henry, 7,191-ton US Joseph Stanton, 5,579-ton British Richmond Hill, 11,404-ton British Vancolite, 2,420-ton Norwegian Vestvangen and 6,390-ton US Virginia. The last of these convoys was KG.779 of 13/16 May 1945 with just the 1,763-ton Dutch Juno.