SS Megantic was a British transatlantic ocean liner that was built in Ireland and launched in 1908.

The Dominion Line operated a transatlantic liner service between Liverpool, Quebec, Montreal and Boston.

RMS Victorian and Virginian were two of the swiftest ships on the route between Britain and Canada, and at more than 10,600 GRT each they were also the largest.

The pair made such an impression that Allan Line won a valuable Canadian Government mail contract before the ships were even launched.

[9] Harland and Wolff built Megantic on slipway number seven of its South Yard in Belfast.

Laurentic was built with experimental combination of machinery which had a triple Propeller arrangement of a central turbine, and two four-cylinder triple-expansion engines that drove the port and starboard propellers, the exhaust steam from their low-pressure cylinders powered the turbine.

This led IMM to specify a similar combination of two triple-expansion engines and one low-pressure turbine for the Olympic-class ocean liners that Harland and Wolff launched in 1910 and 1911.

[10] The White Star and Dominion Lines provided two ships each to run a weekly joint service between Liverpool and Canada.

[10] In July 1910 Metropolitan Police DCI Walter Dew arrested murder suspect Hawley Harvey Crippen and his lover Ethel Le Neve at Rimouski aboard the Canadian Pacific liner Montrose.

[15] Dew repatriated Crippen and Le Neve to Britain aboard Megantic, reaching Liverpool on 28 August.

[18] When the First World War began in 1914, White Star Line briefly put Megantic on its route between Liverpool and New York.

[10] In January 1920 Megantic made one voyage on White Star's joint service with Shaw, Savill & Albion Line, whose main route was between Britain and New Zealand.

[10] In February 1928 Megantic made a Caribbean cruise that included a call at La Guaira in Venezuela.

[10] On 20 July 1931 the Royal Mail Case opened at the Old Bailey, which led to the collapse of White Star Line's parent company.