Ratko is a male given name of Slavic origin, a diminutive form of such names: Ratibor, Ratimir etc., containing word "rati" - war, fight. 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 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 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
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