K series

K series may refer to:


 * Lincoln K series, a line of luxury vehicle
 * Scania K series, a series of bus chassis with longitudinal rear-mounted engines
 * Skoda K series, a heavy howitzer
 * K series engine (disambiguation)
 * International Harvester K and KB series, a line of heavy trucks of the 1940s
 * QI (K series), the eleventh series of quiz show QI
 * Sony Ericsson K series, a series of cell phones
 * K-series (trains), a type of train in China
 * "K" series, a set of messages in the military Variable Message Format data protocol
 * K Series (TV series), a television programming block on Puthuyugam TV
 * K Series, a series of bullion coins produced by Korea Minting and Security Printing Corporation