Sir Richmond Thackeray Willougby Ritchie KCB ISO (1854 – 12 October 1912) was an Indian-born British civil servant. He spent most of his working life at the India Office, reaching the post of Permanent Under-Secretary of State for India.
In 1877 Ritchie entered the India Office through open competition, as a junior clerk. He acted as Private Secretary to a number Under-Secretaries of State, both Parliamentary and Permanent: from 1895 to 1902 he worked for Lord George Hamilton. He then was transferred to the post of Secretary in the Political and Secret Department.
- Kaul, Chandrika. "Ritchie, Sir Richmond Thackeray Willoughby". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/35764. (Subscription or UK public library membership required.)
- "Ritchie, Richmond Thackeray Willoughby (RTCY874RT)". A Cambridge Alumni Database. University of Cambridge.