5K

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
 * Hi Fly (airline) (IATA airline designator)
 * 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
 * Nightmare of Eden (production code: 5K), a 1979 Doctor Who serial