RMMV Stirling Castle was a British ocean liner of the Union-Castle Line built by Harland & Wolff in Belfast for the Southampton to South Africa mail service.

She was launched on 15 August 1935 and was the first of two identical sister ships, being joined a few months later by the Athlone Castle.

In August of that year she set a new record for the route, reaching Table Bay in 13 days 9 hours, beating the previous record of 14 days, 18 hours, and 57 minutes SS Scot had set in 1893.

The mail service was accelerated in 1965 and Stirling Castle and her sisters had insufficient speed to maintain the new schedule.

A proposed sale to Taiwan breakers (where her sister had gone two months earlier) fell through and she was instead sold for scrapping in Japan.