5K or 5-K may refer to:
- 5K resolution, a display resolution with horizontal resolution on the order of 5,000 pixels
- Gnome-Rhône 5K, a radial aircraft engine
- 5000 metres, a long-distance running event in track and field
- 5K run, a long-distance road running competition
- IATA airline designator for the Hi Fly airline
- The Five Ks in Sikhism, five items that Khalsa Sikhs are commanded to wear at all times
- Sander Kleinenberg Presents 5K, 2010 album by Dutch DJ Sander Kleinenberg
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