Nikkō (日光市, Nikkō-shi^?, literally "sunlight" or "sunshine") is a city in the mountains of Tochigi Prefecture, Japan. Approximately 140 km north of Tokyo and 35 km west of Utsunomiya, the capital of Tochigi Prefecture, it is a popular destination for Japanese and international tourists. Attractions include the mausoleum of shogun Tokugawa Ieyasu (Nikkō Tōshō-gū) and that of his grandson Iemitsu (Iemitsu-byō Taiyū-in), and 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.

The Japanese saying "Never say 'kekko' until you've seen Nikko", kekko meaning beautiful, magnificent or I am satisfied is a reflection of the beauty and sites in Nikkō.

As of March 1, 2012, the city has an estimated population of 90,071, with 36,134 households.^{[citation needed]}