Ck1 may refer to:
- AIDC F-CK-1 Ching-kuo, the Taiwainese fighter jet
- the F-16 variant, see F-16 Fighting Falcon variants
- Chang Kong CK-1, the radio-controlled target drone
- Cicaré CK.1, the Argentine helicopter
- the locomotive, see CK class
- 1994 CK1, see 10146 Mukaitadashi
- 1993 CK1, see 20043 Ellenmacarthur
- 1989 CK1, see 4836 Medon
- 1986 CK1, see 3951 Zichichi
- 1983 CK1, see 4198 Panthera
- the illicit drug cocktail, see cocaine and ketamine
- the Calvin Klein product, see Calvin Klein
- Pentecost biogeographic region, see Interim Biogeographic Regionalisation for Australia
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