磷蛋白（Phosphoprotein）是一类含有共价结合的磷酸根的结合蛋白质。

• Fc受体
• 钙调神经磷酸酶（Calcineurin）
• Urocortin
• 酪蛋白

A phosphoprotein is a protein that is posttranslationally modified by the attachment of either a single phosphate group, or a complex molecule such as 5'-phospho-DNA, through a phosphate group. The target amino acid is usually serine, threonine, or tyrosine residues (mostly in eukaryotes), or aspartic acid or histidine residues (mostly in prokaryotes).