North Khorasan province (Persian: استان خراسان شمالی) is one of the 31 provinces of Iran, located in the northeast of the country. Its capital is the city of Bojnord.

North Khorasan is one of the three provinces that were created after the division of Khorasan in 2004. Khorasan was the largest province of Iran until it was divided into three provinces on 29 September 2004. The provinces approved by the parliament of Iran (on 18 May 2004) and the Council of Guardians (on 29 May 2004) were Razavi Khorasan, North Khorasan, and South Khorasan. In 2014, it was placed in Region 5.

Greater Khorasan has witnessed the rise and fall of many dynasties and governments in its territory throughout history. Various tribes of Persians, Arabs, Turks, Kurds and Turkmens have brought change to the region time and time again.

Ancient geographers of Iran divided Iran into eight segments, of which the largest^{[citation needed]} was the territory of Greater Khorasan. Esfarayen, among other cities of the province, was one of the focal points for settlement by Aryan tribes entering Iran.

The Parthian empire was based near Merv in Khorasan for many years. In Parthian times, Esfarayen was one of the important villages of Nishapur.^{[citation needed]}

During the Sasanian era, the province was governed by a Spahbod (Lieutenant General) called "Padgoosban" and four margraves, each commander of one of the four parts of the province.

In the year 651, the army of Islamic Arabs invaded Khorasan. The territory remained in the hands of the Abbasid clan until 820, followed by the rule of the Iranian Taherid clan in the year 896 and the Samanid dynasty in 900. Khorasan was divided into four parts during the Muslim conquest of Persia, each section being named after the four largest cities; Nishapur, Merv, Herat, and Balkh.

Mahmud of Ghazni conquered Khorasan in 994 and in the year 1037 Tuğrul Beg, the first of the Seljuq empire rulers, conquered Nishapur.