Sladen is a surname shared by the following people:
- Charles Sladen (1816–1884), Australian colonial politician
- Douglas Sladen (1856–1947), English author and professor at the University of Sydney
- Elisabeth Sladen (1948–2011), English actress famous for starring in Doctor Who
- Fred Winchester Sladen (1867–1945), a former Superintendent of the United States Military Academy.
- Percy Sladen (1849–1900), English biologist specialising in starfish
- Victoria Sladen (1910–1999), an opera singer of mixed fortunes
Sladen may additionally refer to:
- Percy Sladen Memorial Trust, trust fund administered by the Linnean Society in memory of Percy Sladen
- Sladen's Barbet, a species of bird found in Africa
- Sladen suit, a type of British drysuit, designed for diving