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Faithfull may refer to:
People
- Charles Faithfull (1903–1979), English international rugby union player
- Dean Faithfull (born 1987), English professional gridiron football placekicker
- Emily Faithfull (1835–1895), English women's rights activist, founder of The Victoria Press
- James Faithfull (1817–1873), English first-class cricketer and clergyman
- Leila Faithfull (1896–1994), British artist
- Lilian Faithfull CBE (1865–1952), an English teacher, headmistress, women's rights advocate, magistrate, social worker and humanitarian
- Lucy Faithfull, Baroness Faithfull, a British social worker
- Marianne Faithfull (1946–2025), English singer and actress
- Valentine Faithfull (1820–1894), British clergyman and cricketer
Other
- Faithfull Majesty (Rex Fidelissimus), a sobriquet attached to the Portuguese monarchy
- "Faithfull", a song by Pearl Jam from their 1998 album Yield