'KH' was the designation of Allied convoys (together with a numerical suffix) plying the route from Key West, Florida, to Galveston and Houston, Texas, and as such reciprocals of the 'HK' series (September 1942/May 1945).

The first of the 146 such 'Key West to Houston' convoys was KH.400 of 3/8 September 1942 with the 9,485-ton US A. C. Bedford, 4,779-ton US American Fisher, 4,931-ton US Brandywine, 8,408-ton British British Resolution, 9,475-ton Norwegian Gefion, 6,456-ton British Luculus, 8,865-ton US Northern Sun, 9,231-ton Norwegian Pan Aruba, 10,177-ton Panamanian Standard, 6,403-ton US Tennessee, 9,933-ton US Texas Sun, 6,752-ton US Toteco, 8,258-ton Norwegian Trondheim and 8,135-ton US W. H. Ferguson, and no escorts. The last of the convoys was KH.669 of 6/9 May 1945 with just the 4,480-ton Panamanian Manuel and no escorts.