Nikkō (日光市, Nikkō-shi^?, literally "sunlight" or "sunshine") is a city located in the mountains of Tochigi Prefecture, Japan. Located approximately 140 km north of Tokyo and approximately 35 km west of Utsunomiya, the capital of Tochigi, it is a popular destination for Japanese and international tourists, housing the mausoleum of shogun Tokugawa Ieyasu (Nikkō Tōshō-gū) and that of his grandson Iemitsu (Iemitsu-byō Taiyū-in), as well as the Futarasan Shrine, which dates to the year 767. There are also many famous hot springs (onsen) in the area. Elevations range from 200 to 2,000 m. The mountains west of the main city are part of Nikkō National Park and contain some of the country's most spectacular waterfalls and scenic trails.

As of January 1, 2008, the city has an estimated population of 92,181.