1K

1K or 1-K may refer to:
 * Astra 1K satellite
 * Astra 1KR satellite
 * 1K ZX Chess computer program
 * Southern Cross Distribution (IATA code)
 * Sutra (air company) (IATA code)
 * BMP-1K, see BMP-1
 * BRM-1K, see BMP-1 variants
 * HH-1K, see Bell UH-1 Iroquois variants
 * XMODEM-1K, a model of XMODEM
 * YMODEM-1K, a model of YMODEM
 * GSXR 1K, or Suzuki GSX-R1000
 * Typ 1K, a chassis code of Volkswagen Golf Mk5
 * SSH 1K (WA), see Washington State Route 509
 * Premier 1K, a membership level of United Airlines MileagePlus program
 * 1k as one thousand