word | refer | text |
| kobo | Nigeria | Nigeria 10 kobo 1976 copper nickel |
| Kondratyuk | Ukraine | Ukraine 2 hryvni 1997 copper nickel Yuri Kondratyuk - Scientific Drawing |
| Kong | Hong Kong | Hong Kong 50 cents 1963 H copper nickel |
| kopek | Russia | Russia 1 kopek 1954 aluminum bronze |
| kopeks | Russia | Russia 15 kopeks 1967 copper nickel zinc |
| kopijok | Ukraine | Ukraine 5 kopijok 1992 steel |
| kopiyka | Ukraine | Ukraine 1 kopiyka 1992 steel |
| kopiyky | Ukraine | Ukraine 2 kopiyky 1992 aluminum |
| kopiyok | Ukraine | Ukraine 10 kopiyok 1992 brass |
| Korea | Korea, South | Korea, South 50 won 1972 copper nickel FAO |
| Korsolnickkaja | Ukraine | Ukraine 2 hryvni 1997 copper nickel Solomeja Korsolnickkaja - 1872 - 1952 |
| koruna | Czechoslovakia | Czechoslovakia 1 koruna 1962 aluminum bronze |