Faithfull may refer to:
People
- Emily Faithfull, founder of The Victoria Press
- 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, British 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