HQ often refers to headquarters.
The HQ-9 (Chinese: 红旗; pinyin: hóng qí, "red flag" or "red banner") is China’s new generation medium- to long-range, active radar homing surface-to-air missile.
The HQ-7 (FM-80) (Chinese: 红旗; pinyin: hóng qí, "red flag" or "red banner") is a short-range air defense missile.
The Hongqi-61 (Hongqi = Hong Qi, 红旗, meaning Red Flag or Red Banner) is the first generation Chinese SARH guided surface-to-air missile (SAM).
HQ is the eighth studio album by English folk / rock singer-songwriter and guitarist Roy Harper. It was first released in 1975 by Harvest Records.
HQ Northern Ireland was the formation responsible for the British Army in and around Northern Ireland.
In image processing, hqx ("hq" stands for "high quality" and "x" stands for magnification) is one of the pixel art scaling algorithms developed by Maxim Stepin, used in emulators such as Nestopia, FCEUX, higan, Snes9x, ZSNES and many more.
HQ AB is a Swedish finance and banking corporation founded by Sven Hagströmer and Mats Qviberg, and which is currently being liquidated after having had its banking licence revoked on August 28, 2010.
The S-300 (NATO reporting name SA-10 Grumble) is a series of initially Soviet and later Russian long range surface-to-air missile systems produced by NPO Almaz, based on the initial S-300P version.