Quilliam

• John Quilliam, a British Royal Navy officer and the First Lieutenant on HMS Victory at the Battle of Trafalgar
• Susan Quilliam, an agony aunt and author noted for bringing systemic psychology to a mass audience
• William Abdullah Quilliam, a 19th-century convert from Christianity to Islam, founder of England's first mosque and Islamic centre

  'Quilliam' may also refer to

• Quilliam, a British anti-Islamist think tank
• HMS Quilliam, a Q class destroyer in the Royal Navy during World War II, and the Royal Netherlands Navy 1946–1957