K series may refer to:
Transportation Lincoln K series, a line of luxury vehicle Scania K series, a series of bus chassis with longitudinal rear-mounted engines International K and KB series, a line of heavy trucks of the 1940s K series engine (disambiguation) K-series (trains), a type of train in China
Technology Skoda K series, a heavy howitzer Sony Ericsson K series, a series of phones "K" series, a set of messages in the military Variable Message Format data protocol
Other uses QI (K series), the eleventh series of quiz show QI 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
See also K (disambiguation)