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Ya'qūb ibn al-Layth al-Saffār (), or Ya'qūb-i Layth-i Saffārī (; 25 October 840 – 5 June 879), was a Persian coppersmith and the founder of the Saffarid dynasty of Sistan, with its capital at Zaranj (a city now in south-western Afghanistan). Under his military leadership he conquered much of the eastern portions of the Greater Iran consisting of modern-day Iran, Afghanistan, Turkmenistan, Uzbekistan, Tajikistan as well as portions of western Pakistan and a small part of Iraq. He was succeeded by his brother, Amr ibn al-Layth.