Steell is a surname. Notable people with the name include:
Gourlay Steell RSA (1819–1894), Scottish engraver Graham Steell (1851–1942), Scottish physician and cardiologist John Steell RSA (1804–1891), Scottish sculptor Willis Steell (1866–1941), American journalist, poet, dramatist, novelist and translator
See also Graham Steell murmur, heart murmur typically associated with pulmonary regurgitation Steel (surname)