Sir Greville Douglas Spratt, GBE, TD, JP, DL (1 May 1927 – 13 December 2012) was a British underwriter who was the 660th Lord Mayor of London from 1987 to 1988.
Spratt was educated at Leighton Park School, Charterhouse School, and the Royal Military Academy Sandhurst. He served with the Coldstream Guards from 1945 to 1946, before being commissioned into the Oxfordshire and Buckinghamshire Light Infantry. He was seconded into the Arab Legion from 1946 to 1948.
After leaving the Army, he joined the Infantry Battalion of the Honourable Artillery Company as a private, before being commissioned in the HAC in 1950. He was appointed commanding officer of the HAC in 1962, with the rank of lieutenant colonel. He was Regimental Colonel from 1966 to 1970 and again in 1978. He was Aide-de-Camp to the Queen from 1973 to 1978. Spratt joined Lloyd’s as an underwriter in 1950.