Jadar

Jadar may refer to:


 * Jadar (Drina), a river in western Serbia, tributary to the Drina
 * Jadar (Drinjača), a river in eastern Republika Srpska, Bosnia and Herzegovina, tributary to the Drinjača
 * (Cold Jadar), a river in eastern Republika Srpska, Bosnia and Herzegovina, tributary to Jadar (Drinjača)
 * Jadar (Serbia), a region surrounding the Jadar river in western Serbia
 * Jadar (mineral), sodium lithium boron silicate hydroxide
 * Jadar, Yemen
 * Jæren, a flatland area central to Rogaland, Norway