Zelah is a village in Cornwall, England, United Kingdom, approximately 5 miles (8 kilometres) north of Truro. Zelah is the largest settlement in the civil parish of St Allen. The parish population in the 2001 census was 435.
The A30 London-Land's End road used to pass through Zelah until 1992 when a bypass was built south of the village to divert the trunk road away from the main street. The pub in Zelah is an old coaching inn named The Half Moon, but it was renamed the Hawkins Arms in the 19th century in honour of a descendant of Westcountry seafarer Sir Richard Hawkins.
Zelah is named after a place in ancient Judea which was the burial place of King Saul, his father Kish and his son Jonathan.