CDK

CDK may refer to:
 * CDK Global, a US-based automotive dealer services company
 * The IATA airport code for George T. Lewis Airport, Cedar Key, Florida, United States
 * Charles De Ketelaere, a Belgian professional footballer
 * Chemistry Development Kit, an open source chemical expert system for chemoinformatics and bioinformatics, written in Java
 * Chronic kidney disease, a progressive loss of function of the kidney
 * Chung Do Kwan, founded in 1944, the first of nine schools teaching what came to be known as Taekwondo
 * Complete knock-down, a production technique, often used in automotive industry
 * Curses Development Kit, one of two open source distributions of the Curses widgets library
 * Cyclin-dependent kinase, a major class of enzymes involved in the regulation of the cell cycle