8K

8K or 8k may stand for:
 * 8K resolution
 * 8K UHDTV, a digital video format
 * 8 K, the quantity 8 kelvins
 * 8000 (number), a natural number
 * Form 8-K, a United States Securities and Exchange Commission shareholder notification form for key corporate changes
 * 8,000 metres or 8K, a common running race distance
 * Eight-thousander, a class of tall mountains
 * GCR Class 8K, a class of British 2-8-0 steam locomotive
 * China Railways 8K, an Alstom-built electric locomotive
 * K-Mile Air (IATA airline code)