Mata Utu (French pronunciation: [mata utu]; Wallisian: Matāʻutu, [mataːʔutu]) is the capital city of Wallis and Futuna, an overseas collectivity of France. It is located on the island of Uvéa (ʻUvea), in the district of Hahake, of which it is also the capital. It is one of two ports in Wallis and Futuna, the other being at Leava on Futuna. Hihifo Airport, the main airport serving the island and city, is 5.6 kilometres (3.5 mi) to the northwest. Its population was 1,029 in 2018, up from 815 in 1998.

The most prominent landmarks in the town are the Matâ'Utu Cathedral, the palace next to it and backdrop of the Mt. Lulu Fakahega where there is an old chapel.

In medieval times, Tuʻi Tonga invaders waged war against the islanders and took control. They installed the first chiefs, and called them the Uveas, which became the ruling dynasty of the two islands; they are based at Mata-Utu to this day. During recent archaeological excavations of the area, fortifications built by the Tongans (circa the Middle Ages) were unearthed, at nearby Talierumu and Malama Tagata.

Catholic missionaries, who came to the island in 1837, ensured that the entire population of the islands was converted to Christianity, in a short period of five years. During this time, missionaries not only protected the islanders from the “highhandedness” of the Europeans, but also ensured that a number of churches were built; mainly at Mata-Utu, but also at Mu’a and Vaitupu islands.

In the 19th century, Mata-Utu was developed into a town from a small village, by the French (who installed most of Wallis & Futuna's major facilities). Historically, pigs, poultry, yams, bananas, and coconut were available to arriving boats. During World War II, the Free French sloop Chevreuil landed a detachment of French Marines at Mata-Utu. A small skirmish ensued, after which Vichy French dissidents were taken captive, and the island’s radio communications centre was overtaken. Francis Fox Parry of the 1st Battalion of the 11th Marines also landed here.

Mata-Utu is the largest urban centre on Wallis Island, which lies between Tahiti and Nouméa. Uvea or Wallis island with Mata’Utu as its capital has an area of 60 km² and is part of the larger Wallis archipelago. It is surrounded by coral reefs. Mata’Utu is the administrative headquarters and business capital of the Wallis islands. It is located on the eastern coast, along the main coast road RT1. The north-south RT1 and RT3, coming from the west, intersect in the town centre. Mata-Utu is one of two ports in Wallis and Futuna, the other being at Leava. There are several small islets in the lagoon offshore beyond Mata-Utu Bay (Baie de Mata'utu), including Luaniva, Fugalei, Nukuhione, and Nukuhifala; the islets are a good place for ships to anchor as the shore at Mata-Utu Bay is not adequate for this purpose. Mata Utu Bay lies about 3 miles (5 km) to the northeast of Mua Bay.

Downtown Mata-Utu is dominated by the Matâ'Utu Cathedral, a French national monument, which bears the royal insignia of Wallis, a Maltese cross between its towers. The cathedral is also known as "Our Lady of Good Hope Cathedral", which overlooks the lagoon. Within its vicinity there are, as well as several restaurants, the Au Bon Marche and Oceania market, hotels and the post office, and the simple Palace of the King of Uvéa, which features two-storey verandas adjoining the church.

There is also a platform known locally as Fale Fono on the opposite side of the wharf which was used by the chief of the local tribes to address people. The hill known as the Mt. Lulu Fakahega, which rises to a height of 145 m, forms the backdrop of the village. It has an old chapel at the top. This site is accessed by a short and narrow road and the view from the top of the hill is particularly scenic.