K9 or K-9 most commonly refers to: * K9, the nickname of police dogs and the police dog unit itself * Canine or '' Canis'', a genus including dogs, wolves, coyotes, and jackals * K9 Thunder, a 155mm self-propelled artillery used by the Republic of Korea Armed Forces K9 or K-9 may also refer to:

Fictional dogs

* K9 (''Doctor Who''), the name of several robotic canines in the British science fiction television series ''Doctor Who'' * K-9 (''Looney Tunes''), a dog in the ''Looney Tunes'' cartoon series *

K9 Murphy ''Tokusou Sentai Dekaranger'' is a Japanese television series and the 28th entry in the ''Super Sentai'' series. In an iteration of the planet Earth where extraterrestrial contact is made possible, the S.P.D. (Special Police Dekaranger) battles ...

, a mechanical dog in the Japanese television series ''Tokusou Sentai Dekaranger''

Computing

* AMD K9, a microprocessor * K-9 Mail, a mail client for the Android operating system * K9 Web Protection, a web content control software * K9Copy, a DVD backup and authoring program for Unix-like operating systems

Entertainment

* ''K-9'' (film), a 1989 American film ** ''K-9'' (film series), a film series consisting of four movies * ''K-9'' (TV series) a British/Australian comedy/adventure series starring the same character as featured in ''Doctor Who'' * K9, a television station serving Boise, Idaho, now known as KNIN-TV * Sonata in G for Keyboard and Violin, K. 9, a sonata by Wolfgang Amadeus Mozart

Military

* HMAS ''K9'', an Australian submarine * K-9 (missile), a Soviet short-range air-to-air missile * Kahr K9, a variant of the Kahr K series, a 9×19mm Parabellum semi-automatic pistol manufactured by the American company Kahr Arms * Pusan East (K-9) Air Base, an abandoned air base in Busan, South Korea

Automotive

* Kia K9, a full-size luxury sedan * K-9 (Kansas highway), a state highway in Kansas, US *

BYD K9 The BYD K-series bus (sometimes just referred to as the BYD ebus or BYD electric bus) are a line of battery electric buses manufactured by the Chinese automaker BYD, powered with its self-developed lithium iron phosphate battery, featuring a ty ...

, a battery electric bus

Other