复合蛋白质，是蛋白质与非胺基酸分子结合而成。

• 蛋白质与糖类结合而成糖蛋白
• 蛋白质与核酸结合而成核蛋白
• 蛋白质与铁结合而成铁蛋白

A conjugated protein is a protein that functions in interaction with other (non-polypeptide) chemical groups attached by covalent bonding or weak interactions.

Many proteins contain only amino acids and no other chemical groups, and they are called simple proteins. However, other kind of proteins yield, on hydrolysis, some other chemical component in addition to amino acids and they are called conjugated proteins. The non-amino part of a conjugated protein is usually called its prosthetic group. Most prosthetic groups are formed from vitamins. Conjugated proteins are classified on the basis of the chemical nature of their prosthetic groups.