Ratko (Cyrillic script: Ратко) is a male given name of Slavic origin, a diminutive form of such names: Ratibor, Ratimir etc., containing word rat meaning "war". The name may refer to:
Ratko Čolić (1918–1999), Serbian footballer
Ratko Đokić, "The Godfather", arms dealer, cigarette smuggler, murdered May 5, 2003
Ratko Dautovski, Macedonian percussionist, interested in world percussion
Ratko Delorko, German pianist, composer, producer and conductor
Ratko Đokić (1940–2003), Yugoslavian-Swedish mob boss, a leader of the so-called "Cigarette Mafia"
Ratko Dostanić (born 1959), Serbian football (soccer) head coach
Ratko Glavina (born 1941), Croatian actor
Ratko Janev (born 1939), physicist
Ratko Kacian (1917–1949), Croatian footballer
Ratko Mladić (born 1942), Chief of Staff of the Bosnian Serb Army during the Bosnian War of 1992–1995
Ratko Nikolić (born 1977), Serbian handballer
Ratko Ninković (born 1967), football manager and former player from Bosnia-Herzegovina
Ratko Perić (born 1944), the Bishop of Mostar-Duvno and Apostolic Administrator of Trebinje-Mrkan
Ratko Radovanović (born 1956), basketball player
Ratko Rudić (born 1948), Croatian water polo coach
Ratko Stevović, Montenegrin football manager
Ratko Štritof (born 1972), Croatian water polo player
Ratko Svilar (born 1950), former Serbian football goalkeeper
Ratko Vansimpsen (born 1989), Belgian footballer
Ratko Varda (born 1979), Serbian professional basketball player
Ratko Vujović (born 1916), Montenegrin political activist and soldier
Ratko Zjaca, Croatian guitarist