List of Fellows of the Royal Society elected in 1921
Fellows
- Wilfred Eade Agar
- Francis William Aston
- Sir William Lawrence Bragg
- William Thomas Calman
- Arthur Harry Church
- Georges Dreyer
- William Henry Eccles
- Sir John Charles Grant Ledingham
- Charles Stewart Middlemiss
- Kennedy Joseph Previte Orton
- Sir John Herbert Parsons
- James Charles Philip
- Alfred Arthur Robb
- Sir Eustace Henry William Tennyson D'Eyncourt
- George Udny Yule
Foreign Members
- Leon Charles Albert Calmette
- Henri Alexandre Deslandres
- Albert Einstein
- Albin Haller
- Edmund Beecher Wilson
- Pieter Zeeman