Fortnum may refer to:

• Fortnum & Mason, English department store.
• William Fortnum, its founder.
• Peggy Fortnum (1919–2016), English writer and illustrator, notably of Paddington Bear.

• Campbell, Robin
• Campbell, Ronald
• Campbell, Roy
• Campbell's alligator lizard
• Campbell Saunders
• Campbell Savours
• Campbell's Bridge
• Campbellsburg (disambiguation)
• Campbell School
• Campbells Corner, Michigan
• Campbell, Scott
• Campbell's Creek, Newfoundland and Labrador
• Campbells Creek (West Virginia)
• Campbells (disambiguation)
• Campbells dwarf hamster
• Campbells Dwarf hamster
• Campbell's Dwarf hamster
• Campbell Settlement, Kings County
• Campbell Settlement, New Brunswick
• Campbell's Fairywren
• Campbell's Ferry
• Campbell's Forest Toad
• Campbell's formula
• Campbell's Funeral Home
• Campbell Shag