HKO may refer to:
* ''
Hello Kitty Online
''Hello Kitty Online'' was a free-to-play massively multiplayer online role playing game active from 2008 to 2017, developed by Sanrio Digital and Typhoon Games. The game is tied to the SanrioTown website, where players are required to register a ...
'', a video game
*
Helsinki Philharmonic Orchestra
The Helsinki Philharmonic Orchestra (in Finnish: ; in Swedish: ; literal English translation: Helsinki City Orchestra; commonly abbreviated as HPO) is an orchestra based in Helsinki, Finland. Founded in 1882 by Robert Kajanus, the Philharmonic ...
(Finnish: )
*
Hong Kong Observatory
The Hong Kong Observatory is a weather forecast agency of the government of Hong Kong. The Observatory forecasts the weather and issues warnings on weather-related hazards. It also monitors and makes assessments on radiation levels in Ho ...
*
Hankou railway station, China Railway pinyin code HKO
{{Disambiguation