Alborz province (Persian: استان البرز) is one of the 31 provinces of Iran. Its capital is the city of Karaj, which lies 40 km west of Tehran, at the foothills of the Alborz mountains. Alborz is Iran's smallest province in area.

In 2010, Karaj, Nazarabad, and Savojbolagh Counties were separated from Tehran province in the establishment of Alborz province.

The majority of the population of Alborz identify as ethnic Persians.^{[citation needed]}

At the time of the 2006 National Census, the counties that were later to form the province had a total population of 2,053,233. The first census after the creation of Alborz province counted 2,412,513 people in 2011. The 2016 census measured the population of the province as 2,712,400 people.

The population history and structural changes of Alborz province's administrative divisions over two censuses are shown in the following table.

According to the 2016 census, 2,512,737 people (over 92% of the population of Alborz province) live in the following cities:

Media related to Alborz Province at Wikimedia Commons

Alborz (province) travel guide from Wikivoyage