Greater Khorasan is an area of land from the past which included parts that are presently in Iran, Afghanistan, Tajikistan, Turkmenistan, and Uzbekistan.

Some of the main historical cities of Persia are located in the older Khorasan: Nishapur (now in Iran), Merv and Sanjan (now in Turkmenistan), Samarqand and Bukhara (both now in Uzbekistan), Herat, Balkh and Ghazni (now in Afghanistan).