Isti may refer to:

• Isti (Greece), a town of ancient Greece

• Isti Baghcheh, a village in Ardabil province, Iran

• Isti (Hinduism), one of the five types of yajna in Vedic times

• Istituto di Scienza e Tecnologie dell'Informazione, a research institute of the Consiglio Nazionale delle Ricerche in Italy