Nadur (Maltese: In-Nadur) is an administrative unit of Malta, located in the eastern part of the island of Gozo. Nadur is built on a plateau and is one of the largest localities in Gozo. Known as the 'second city', it spreads along a high ridge to the east of Victoria. It had a population of 4,509 as of March 2014.

The word is derived from the Arabic word ‘nadara’, which means 'lookout', pretty much having the same meaning as its motto ‘Vigilant’. The motto appears in Nadur’s coat of arms that shows the sun coming up from blue seas. The town is famous for its bakeries.

Near Nadur are San Blas and Dahlet Qorrot Bays, tiny rocky bays on the North Eastern coast. These are locations for swimming, snorkeling, picnics, and trekking.

There are no documents or archaeological evidence which could shed light on the colonisation of Nadur by its first inhabitants. Nevertheless, the plateau and its surroundings, with a few farmhouses scattered here and there, were in existence for many years well before the area became a parish. The only trace of archaeological evidence were a number of large flat stones found in a field between San Blas Bay and Daħlet Qorrot. According to the Gozitan historian Giovanni Pietro Francesco Agius de Soldanis these roofed structures, which do not exist anymore, once used to serve as a sort of temple to gods. He also imagined that these slabs of stone couldn't have been placed there by normal people but by very strong people or giants. He also wrote that Nadur may have been founded during the time of the Greeks. One proof of this connection is a bronze statue of Apollo said to be found in Nadur in 1744.

Throughout history, Nadur played a very important role in the defence of the island from corsairs, hence the name. During the reign of the Knights of St. John, a watch tower was built by Grandmaster Nicolas Cotoner which has been referred to by Daħlet Qorrot Tower or San Blas Tower for the two bays lying on either side of it. The tower is locally known as Isopu Tower.

Another watchtower found in Nadur is Ta' Kenuna Tower built by the British towards the middle of the 19th century. It served as a telegraph link between Malta and Gozo. From the top of this semaphore tower, one can see most of the island, Comino and Mellieħa with a wonderful view in the winter of the green fields and the blue sea. The area near the tower was constructed into a garden.

As of March 2014, Nadur had a population which neared 4,500 people, which makes it the third most populated Gozitan town after Xagħra and Victoria.

A small number of people earn their living from the sea as fishermen or sailors. Almost all other people work as businessmen, analysts, teachers, and other professions.^{[citation needed]}