'EC' (i) was the designation of British coastal convoys (together with a numerical suffix) plying from Southend to the Clyde river, Oban and Loch Ewe as a replacement for the EN convoys (March/November 1941).

The first of the 90 such convoys was EC.1 of 31 March/5 April with as many as 35 merchant vessels, and the last was EC.91 of 28 October/2 November with as many as 53 merchant vessels.