PKA

PKA may refer to:


 * Napaskiak Airport (IATA code), airport in Napaskiak, Alaska
 * Professionally known as:
 * Pen name
 * Stage persona
 * pKa, the symbol for the acid dissociation constant at logarithmic scale
 * Protein kinase A, a class of cAMP-dependent enzymes
 * Pi Kappa Alpha, the North-American social fraternity
 * Public key authentication, establishing key authenticity in public-key cryptography
 * Professional Karate Association
 * Primary knock-on atom, an atom that is displaced from its lattice site by irradiation
 * Painkiller Already, a podcast featuring FPSRussia
 * Pentax KA-mount, a camera lens mount

Non-Latin

 * The Latin letters PKA are visually similar to the Cyrillic acronym РКА, the Russian Federal Space Agency