Istra may refer to:

• Istra River, a river in Russia
• Istra, Istrinsky District, Moscow Oblast, a town in Istrinsky District of Moscow Oblast, Russia
• Istra River (Romsdal), a river in Norway
• FC Istra, an association football club in Russia
• NK Istra, an association football club in Croatia
• NK Istra 1961, an association football club in Croatia
• Istria or Istra, a peninsula in the Adriatic Sea
• Istria County, the Croatian portion of the Istria peninsula
• Istra, Krasnogorsky District, Moscow Oblast, an inhabited locality named Istra in Krasnogorsky District, Moscow Oblast
• Istra Reservoir, a reservoir in Russia near Millerhof palace

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