Gwillim is a surname. Notable people with the surname include:
David Gwillim (born 1948), English actor Elizabeth Gwillim (bird artist) (1763–1807), English artist and naturalist Elizabeth Simcoe (1762–1850), née Elizabeth Posthuma Gwillim, English artist and diarist in colonial Canada Gareth Gwillim (born 1983), English professional footballer Henry Gwillim ( 1760–1837), British judge Jack Gwillim (1909–2001), English character actor Moore Gwillim (died 1611), Welsh politician Sarah-Jane Gwillim, British television and stage actress
See also Bradford West Gwillimbury, Ontario, Canada Castle Frank Brook, a buried creek in Toronto, Ontario, Canada named after Francis Gwillim East Gwillimbury, Ontario, Canada Gwillim Lake Provincial Park, British Columbia, Canada