MV Catriona is a pioneering diesel electric hybrid passenger and vehicle roll-on, roll-off ferry built for Caledonian MacBrayne for the Claonaig–Lochranza crossing. She is the third hybrid ferry commissioned and owned by Caledonian Maritime Assets, one of three such ferries in the world to incorporate a low-carbon hybrid system of diesel electric and lithium ion battery power. The ferries are sea-going and are nearly 46 metres (150 ft) long, accommodating 150 passengers, 23 cars or two HGVs.

Caledonian MacBrayne, in short form CalMac, is the trade name of CalMac Ferries Ltd, the major operator of passenger and vehicle ferries to the west coast of Scotland, serving ports on the mainland and 22 of the major islands. It is a subsidiary of holding company David MacBrayne, which is owned by the Scottish Government.