PKB

PKB is a three-letter abbreviation that may refer to:
 * Państwowy Korpus Bezpieczeństwa, WWII Polish underground police
 * Patients Know Best, a tool for allowing the patient to share medical records with clinicians
 * National Awakening Party (Partai Kebangkitan Bangsa), an Islamic political party in Indonesia
 * Base dissociation constant pKb of a chemical compound
 * Protein kinase B, an enzyme
 * Mid-Ohio Valley Regional Airport in Parkersburg, West Virginia, US
 * Personal knowledge base, a subjective database
 * PerfKit Benchmarker of cloud performance
 * PKB Corporation, a Serbian agribusiness company