Sir Ernest Ridley Debenham, 1st Baronet (26 May 1865 – 25 December 1952), was an English businessman.
Born at 42 Wigmore Street, Marylebone, he was the son of Frank Debenham and his wife Emma Folkard née Ridley.
He was elected unopposed at a by-election on 28 February 1912 for the Conservative-backed Municipal Reform party to represent the Marylebone East division, remaining a councillor until 1919.
On his retirement in 1927 he sold most of his shares in the firm for £1.8M, so severing his family's connections with the retail chain that still bears his name.
[7] He died on Christmas Day 1952 at Moor Lane House, Briantspuddle, Dorset, and was succeeded in the baronetcy by his son, Piers Kenrick Debenham, born in 1904.