| K-DPM | KSC (Kennedy Space Center) DOD (Department Of Defense) Payloads Management plan/requirement 
| Others |
| K-DPN | KSC (Kennedy Space Center) DOD (Department Of Defense) Payloads Notice
| Others |
| K-DPPS | KSC (Kennedy Space Center) DOD (Department Of Defense) Payloads Project Specification
| Others |
| K-IUSM | KSC (Kennedy Space Center) Inertial Upper Stage plan/requirement Management
| Others |
| K-IUSN | KSC (Kennedy Space Center) Inertial Upper Stage Notice
| Others |
| K-Kill | Catastrophic Kill
| Others |
| K-MAP | Karnaugh map
| Others |
| K-POP | Korean Pop
| Others |
| K-RESA | Kalamazoo Regional Educational Service Agency
| Others |
| K-SADS | Kiddie-Schedule for Affective Disorders and Schizophrenia
| Others |
| K-SLM | KSC (Kennedy Space Center) SpaceLab Management Plan/Requirement
| Others |
| K-SLN | KSC (Kennedy Space Center) SpaceLab Notice
| Others |
| K-SLPS | KSC (Kennedy Space Center) SpaceLab Project Specification
| Others |
| K-SM | KSC (Kennedy Space Center) Shuttle Management document
| Others |
| K-SPN | KSC (Kennedy Space Center) Shuttle Project Notice
| Others |
| K-SPS | KSC (Kennedy Space Center) Shuttle Project Specification
| Others |
| K-SSS | KSC (Kennedy Space Center) Shuttle project Station set Specification
| Others |
| K-STSM | KSC (Kennedy Space Center) Space Transportation System Management Plan/Requirement
| Others |
| K-STSN | KSC (Kennedy Space Center) Space Transportation System Notice
| Others |
| K-WIRE | Kirschner wire
| Others |
| K.1 | Kindergarten 1
| Others |
| K.2 | Kindergarten 2
| Others |
| K.3 | Kindergarten 3
| Others |
| K.C. | King's Counsel
| Others |
| K.C. | Knights of Columbus
| Others |
| K.C.B. | Knight Commander, Order of the Bath
| Others |
| K.I.C.K.S. | Kids Involving Cops for Knowledge and Sport
| Others |
| K.M. | Knight of Malta
| Others |
| K.S.S. | Knight, Order of Saint Sylvester, Pope
| Others |
| K.St.G.G. | Knight, Order of Saint Gregory the Great
| Others |
| K/D | Kill to Death
| Others |
| K/DOQI | Kidney Disease Outcomes Quality Initiative
| Others |
| K/S | Kick Stage
| Others |
| K08MM | LPTV-8, Bakersfield, California
| Others |
| K09VR | LPTV-9, Austin, Texas
| Others |
| K1 | Kommune 1
| Others |
| K12 | Kindergarten through 12th Grade
| Others |
| K15 | Grand Glaize - Osage Beach Airport, Osage Beach, Missouri USA
| Others |
| K2 | Karakoram 2
| Others |
| K200AA | LPFM-87.9, Sun Valley, Nevada
| Others |
| K21FP | LPTV-21, Bakersfield, California
| Others |
| K26 | Carrollton City Airport, Carrollton, Missouri USA
| Others |
| K27EE | LPTV-27, Ukiah, California
| Others |
| K289AJ | LPFM-105.7, West Point, California
| Others |
| K2B | Keswick to Barrow Walk
| Others |
| K2C | Karting to Cars
| Others |
| K2C | kindergarten to college
| Others |
| K2K | Kerb to Kerb
| Others |
| K2M | Kilometers to Miles
| Others |
| K2OC | Kenari and Kelisa Owners Club
| Others |