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Fortnum 
Summary
Fortnum may refer to:
- Fortnum & Mason, English department store.
- William Fortnum, its founder.
- Charles Drury Edward Fortnum (1820-99), a later member of the same family, art collector, historian, and benefactor of the University of Oxford.
- Peggy Fortnum (1919–2016), English writer and illustrator, notably of Paddington Bear.