Abbas III (Persian: شاه عباس سوم, romanized: ʿAbbās; January 1732 – February 1740) was a son of Shah Tahmasp II and Shahpari Begum of the Safavid dynasty and reigned from 1732 to 1736.

[1] Nader Khan, who was the real ruler of the country, assumed the positions of deputy of state and viceroy.

[2] In 1738, Nader Shah set out on campaign to Afghanistan and India, leaving his son Reza Qoli Mirza to rule his realm in his absence.

According to the most "authoritative account",[3] Mohammed Hosein Khan Qajar, who had been entrusted with supervising Abbas and his father in captivity, warned Reza that on hearing the news of Nader's death, the townspeople of Sabzevar would rise up in revolt, free Tahmasp II and place him on the throne again.

Mohammed Hosein strangled Tahmasp, cut the young Abbas down with his sword and also had his brother Esmail killed.