James Alexander Wedderburn "Hamish" St. Clair-Erskine MC (23 August 1909 – 17 December 1973) was a British soldier and Scottish aristocrat aesthete.

Known as Hamish, he was born at Chetwode, White Waltham, Maidenhead, the first child of James St Clair-Erskine, 5th Earl of Rosslyn (1869–1939), and his third wife, Vera Mary Bayley.

In the Letters edited by Betjeman's daughter, Candida Lycett Green, and published in 1996, she remembers how her father and Erskine "went out in fast cars, driving all night in the flat country near Coolham".

[6] Erskine fought in the World War II, became a Major in the Coldstream Guards, escaping from a prison camp and walking through Italy to join the Allied troops.

[11] After Erskine's death in 1973, Alan Payan Pryce-Jones described him as a "bright apparition who once upon a time swept past them like a kingfisher: all colour and sparkle and courage [...] [he found] small place in a world which turned away from an unambitious charmer whose only enduring gift was his charm".