Kozlovsky (masculine) or Kozlovskaya (feminine) is a Russian surname. Notable people with the surname include:
Aleksey Kozlovsky (1905–1977), Russian composerDanila Kozlovsky (born 1985), Russian actorEugene Kozlovsky (born 1946), Russian writer, journalistFyodor Kozlovsky (died 1770), Russian writerIvan Kozlovsky (1900–1993), Soviet singer (tenor)Marina Kozlovskaya (born 1925), Soviet Russian painterMikhail Kozlovsky (1753–1802), Russian sculptorOsip Kozlovsky (1757–1831), Russian composerPavel Alexandrovich Kozlovsky, Russian generalPavel Pavlovich Kozlovsky (born 1942), Soviet and Belarusian general and politicianPyotr Kozlovsky (1783–1840), Russian diplomat and man of lettersSerhiy Kozlovskyy (Kozlovsky) (born 1986), Ukrainian historian, journalistStanislav Kozlovsky, contributor to the Russian computer magazine Computerra who wrote an article on Ithkuil, a constructed languageValentina Kozlovskaya (born 1938), Russian chess playerVikenty Kozlovsky, Russian generalOndřej Kozlovský (born 1982), Czech bobsledderRadim Kozlovský, paraplegic Czech athlete who participated in the 2006 Winter Paralympic Games in Turin