Sir Reginald John Cust (1828 – 11 June 1913) was a barrister of Lincoln's Inn, judge, and Chief Commissioner of the West India Incumbered Estates Commission.
Henry Cockayne Cust (1780–1861), of Cockayne Hatley in Bedfordshire, a Canon of Windsor,[3] a younger son of Brownlow Cust, 1st Baron Brownlow of Belton House in Lincolnshire.
He was educated at Eton and Trinity College, Cambridge, where he studied the mathematical tripos and graduated 15th Wrangler in 1852.
She was the author of (as "Lady Elizabeth Cust") Some Account of the Stuarts of Aubigny, in France, London, 1891[5] and of Records of the Cust family of Pinchbeck, Stamford and Belton in Lincolnshire, 1479-1700, 3 vols, 1898.
By his wife he had issue including: Reginald Cust died in London on 11 June 1913.