Naantali is a town in southwestern Finland, known as one of the most important tourist centres of the country at summer-time. The municipality has a population of 19,427 (31 December 2020), and is located in the region of Southwest Finland, 14 kilometres (8.7 mi) west of Turku.

The town encompasses a land area of 311.50 square kilometres (120.27 sq mi). Most of this area is located on the islands, but the majority of the population lives on the mainland. Most of the islands are covered with forest and farmland, while the mainland consists chiefly of residential areas.

This interesting divide between urban and rural is perhaps one reason as to why the city has been named the most popular tourist centre in the country in numerous surveys. Another factor affecting this is the proximity of both Turku, the region's administrative centre and largest city, and of the archipelago.

There are some important points of interest in the city, such as the Moomin World theme park on the island of Kailo.

Naantali Spa Hotel, the largest spa in the Nordic countries, and the Naantali's medieval convent stone church. The city's popularity as a tourist venue is highlighted by the fact that the official summer residence of the President of Finland, the Kultaranta estate, is located on Luonnonmaa.

The archipelago sea boat traffic is handled by S/S Ukkopekka. Old steamship cruise Naantali-Turku-Naantali.

Naantali hosts an international music festival every June, and the traditional Sleepyhead Day carnival in July.