Trevor Ogilvie-Grant, 4th Baron Strathspey (2 March 1879 – 11 November 1948) was a British peer concerned with colonial affairs in the House of Lords.

Strathspey was born on 2 March 1879 in Oamaru, North Otago, New Zealand.

He had six siblings, including his elder brother, James Ogilvie-Grant, 11th Earl of Seafield.

Upon the death of his elder brother, James Ogilvie-Grant, 11th Earl of Seafield, in 1915, he succeeded to the barony of Strathspey in the Peerage of the United Kingdom and emigrated to Britain and took his seat in the House of Lords.

[8] Before her death on 18 November 1945, they had two children in New Zealand: His second marriage was in March 1947 to Elfrida Minnie Fass, daughter of Gordon Cloete of Cape Town in South Africa, and widow of Colonel Capron, York and Lancaster Regiment.