Zaria (formerly Zazzau) is a metropolitan city in Nigeria, located within four local government areas in Kaduna State. It serves as the capital of the Zazzau Emirate Council and is one of the original seven Hausa city-states. The local government areas comprising Zaria are Zaria, Sabon Gari, Giwa, and Soba local government areas of Kaduna State, Nigeria.

It contains Nigeria's largest university, Ahmadu Bello University, and various tertiary institutions including the Federal College of Education (FCE Zaria), Nigerian College of Aviation Technology, Nigerian Institute of Transport Technology, Nigeria Institute of Leather and Science Technology and Nuhu Bamalli Polytechnic. Nigerian College of Aviation Technology. Department of Agriculture Ahmed Bello University Zaria. Ameer Shehu Idris College of Advanced Diploma.

From the 2006 population census, Zaria was estimated to have 736,000 people. It is home to the Emir of Zazzau.

Zaria, initially known as Zazzau, was the capital of the Hausa kingdom of Zazzau. Zazzau is thought to have been founded in or about 1536 and in the late 16th century it was renamed after Queen Amina's sister, Zaria. Human settlement predates the rise of Zazzau, as the region, like some of its neighbors, had a history of sedentary Hausa settlement, with institutional market exchange and farming.

Zaria was the most southern of the Hausa city-states. It was a trading destination for Saharan caravans as well as a prominent city in the Hausa slave trade. In the late 1450s, Islam arrived in Zaria by the way of its sister Habe cities, Kano and Katsina. Along with Islam, trade flourished between the cities as traders brought camel caravans filled with salt in exchange for slaves and grain. The city-state's power peaked under Queen Amina whose military campaigns established a tributary region including the kingdoms of Kano and Katsina. At the end of the 16th century, after Queen Amina's death, Zaria fell under the influence of the Jukun Kingdom and eventually became a tributary state itself. Between the fifteenth and sixteenth century the kingdom became a tributary state of the Songhai Empire. In 1805 it was captured by the Fulani during the Fulani Jihad. British forces led by Frederick Lugard took the city in 1901.

A French hostage of the Islamist group Ansaru, held captive at Zaria, escaped in 2013 and reached a police station in the city.

In December 2015, Nigeria's military was reported to have killed 300 Shia Muslims and buried their bodies in a mass grave, following their physical attack and blockade of the Chief of Army Staff, General Tukur Yusuf Burtai in an area they claimed to own as they don't recognize the leadership of the Republic of Nigeria. Although the government denies the killing part, it has been described as a massacre.

The old part of the city, known as Birnin Zazzau or Zaria City, was originally surrounded by walls and fortress, which have been mostly removed. The Emir's palace is in the old city. In the old city and the adjacent Tudun Wada neighbourhood people typically reside in traditional adobe compounds. These two neighborhoods are predominantly occupied by the indigenous Hausa.