Sir Courtenay Peregrine Ilbert, GCB, KCSI, CIE, FBA (12 June 1841 – 14 May 1924) was a distinguished British lawyer and civil servant who served as legal adviser to the Viceroy of India's Council for many years until his eventual return from India to England. His later career included appointments as the First Parliamentary Counsel (1899–1902) and as Clerk of the House of Commons from 1902 to 1921.