Sealink was a ferry company based in the United Kingdom from 1970 to 1984, operating services to France, Belgium, the Netherlands, Isle of Man, Channel Islands, Isle of Wight and Ireland.

Ports served by the company included: Dover, Folkestone, Newhaven, Southampton and Harwich for services to the European continent; Holyhead, Fishguard, Heysham and Stranraer for services to Ireland and the Isle of Man; Weymouth and Portsmouth for services to the Channel Islands. The Isle of Wight was also served from Portsmouth and Lymington.
Sealink also operated the Steamer passenger ferry services on Windermere in Cumbria until privatisation, when these were passed to the newly reformed Windermere Iron Steamboat Company (now Windermere Lake Cruises Ltd).