This document lists various protein databases that can be categorized into protein sequence databases, proteomics databases, protein structure databases, secondary databases, protein model databases, and protein-protein interaction databases. Some of the major protein sequence databases included are UniProt, Swiss-Prot, Pfam, and PROSITE. The Protein Data Bank (PDB) is a central repository for 3D protein structure data. Other databases like SCOP and CATH provide structural classification of proteins. Databases such as IntAct and STRING contain information on known and predicted protein-protein interactions.