Steil is a surname. Notable people with the surname include:
Benn Steil, American economist Bryan Steil (born 1981), American politician David J. Steil (born 1942), American politician Fiona Steil-Antoni (born 1989), Luxembourg chess player George Henry Steil Sr. (1861–1926), American politician Jennifer Steil (born 1968), American author and journalist Marie Henriette Steil (1898–1930), Luxembourg writer and feminist