Lieutenant-Colonel Robert George Grosvenor, 5th Duke of Westminster, TD, JP, DL (24 April 1910 – 19 February 1979), was a British soldier, landowner, businessman and politician.

Grosvenor was educated at Eton College, an all-boys public boarding school in Berkshire.

[1] On 28 June 1938, Grosvenor was commissioned into the 11th (City of London Yeomanry) Light Anti-Aircraft Brigade, a newly formed Territorial Army unit of the Royal Artillery, as a second lieutenant.

[2] On 1 May 1947, he transferred to the reformed City of London Yeomanry (Rough Riders) and was promoted from his pre-war substantive rank of second lieutenant to major with seniority from 24 April 1944.

[3] On 11 November 1949, he was awarded the Efficiency Decoration (TD) for long service with the Territorial Army.

[8] Grosvenor lived in Northern Ireland most of his life at Ely Lodge, Blaney, on an island in the middle of Lough Erne.

They had three children: Westminster died on 19 February 1979 at Ely Lodge, near Enniskillen in Northern Ireland.