QX may refer to:
- Horizon Air, an airline
- QX (magazine), a magazine in Scandinavia for LGBT people
- QX (British magazine), a free weekly magazine distributed in London and Brighton for LGBT people
- Epson QX-10 or QX-16, a computer
- Nissan Maxima, a large car sold as the QX in the UK market in the late 90s
- a substitute for "Roger" (or "OK") in E. E. Smith's Lensman series
- The probability of death of a person aged x years, before reaching the age x+1 (see Life Expectancy)
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