Kozelsky ({{lang-ru|Козельский}}; masculine), Kozelskaya ({{lang|ru|Козельская}}; feminine), or Kozelskoye ({{lang|ru|Козельское}}; neuter) is the name of several rural localities in Russia:

• Kozelskoye, Kaluga Oblast, a village in Borovsky District of Kaluga Oblast
• Kozelskoye, Ryazan Oblast, a village in Aristovsky Rural Okrug of Klepikovsky District of Ryazan Oblast

• Istvan Kovacs (footballer born 1991)
• Istvan Kovacs (footballer born 1992)
• Istvan Kovats
• Istvan Kovesfalvi
• Istvan Kozma (wrestler)
• Istvan Kuezmics
• Istvan Kulcsar
• Istvan Kuzmics
• Istvan Ladai
• Istvan Ladoczki
• Istvan Lang
• Istvan Lanstyak
• Istvan Lichteneckert
• Istvan Lukacs
• Istvan Lulik
• Istvan Major
• Istvan Majoros
• Istvan Marosi
• Istvan Martin
• Istvan Marton
• Istvan Medgyaszay
• Istvan Meszaros (canoer)
• Istvan Meszaros (professor)
• Istvan Mona
• Istvan Mudin