Keay is a surname. Notable people with the surname include:
Anna Keay (born 1974), a British historian
Jack Keay (born 1960), Scottish footballer
John Keay (born 1941), a British historian, journalist and writer
John Seymour Keay (born 1839), a Scottish businessman and a Member of UK Parliament
Nigel Keay (born 1955), New Zealand musician
Watty Keay (1871–1943), Scottish footballer