'MK' was the designation of Allied convoys (together with a numerical and sometimes a literal suffix) plying the route from Madagascar to Kilindini, Kenya, and as such reciprocals of the 'KM' (i) series (August 1942/March 1945).

The first of these 24 convoys was MK.3 of 23/26 August 1942 involving four British merchant vessels (11,080-ton Dilwara, 11,162-ton Dunera, 9,248-ton Empire Pride and 7,174-ton Ocean Viking), and the last was MK.8J of 20/23 March 1945 involving only the 6,852-ton Polish Kosciuszko.