In organosulfur chemistry, sulfinamide is a functional group with the structure  (where R = alkyl or aryl). This functionality is composed of a sulfur-carbon () and sulfur-nitrogen () single bonds, as well as a sulfur-oxygen double bond (), resulting in a tetravalent sulfur centre (in resonance with its zwitterionic form). As a non-bonding electron pair is also present on the sulfur, these compounds are also chiral. They are sometimes referred to as S-chiral sulfinamides. Sulfinamides are amides of sulfinic acid ().