Sports in Japan are a significant part of Japanese culture. Both traditional sports such as sumo and martial arts, and Western imports like baseball and association football, are popular with both participants and spectators.

Sumo wrestling is considered Japan's national sport. Baseball was introduced to the country by visiting Americans in the 19th century. The Nippon Professional Baseball league is Japan's largest professional sports league. Martial arts such as judo, karate and modern kendō are also widely practiced and enjoyed by spectators in the country. Association football has gained wide popularity since the founding of the Japan Professional Football League in 1992. Other popular sports include figure skating, golf and racing, especially auto racing.

Sumo shows an important side of traditional Japanese sport, a religious occasion as well as a sporting event. Many sumo rituals are closely associated with Shinto belief. It is believed that some of ancient sumo matches were a purely religious event with a predetermined outcome as an offering to kami. Some matches are done as divination. For example, if a fisherman and farmer held a match and the fisherman won, a good catch was predicted for the year.

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Japan ⁱ/dʒəˈpæn/ (Japanese: 日本 Nihon or Nippon; formally 日本国  Nippon-koku or Nihon-koku, literally the State of Japan) is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south. The characters that make up Japan's name mean "sun-origin", which is why Japan is sometimes referred to as the "Land of the Rising Sun".

Japan is an archipelago of 6,852 islands. The four largest islands are Honshū, Hokkaidō, Kyūshū and Shikoku, together accounting for ninety-seven percent of Japan's land area. Japan has the world's tenth-largest population, with over 127 million people. The Greater Tokyo Area, which includes the de facto capital city of Tokyo and several surrounding prefectures, is the largest metropolitan area in the world, with over 30 million residents.

Archaeological research indicates that people lived in Japan as early as the Upper Paleolithic period. The first written mention of Japan is in Chinese history texts from the 1st century AD. Influence from other nations followed by long periods of isolation has characterized Japan's history. In the late 19th and early 20th centuries, victory in the First Sino-Japanese War, the Russo-Japanese War and World War I allowed Japan to expand its empire during a period of increasing militarism. The Second Sino-Japanese War of 1937 expanded into part of World War II in 1941, which came to an end in 1945 following the atomic bombings of Hiroshima and Nagasaki. Since adopting its revised constitution in 1947, Japan has maintained a unitary constitutional monarchy with an emperor and an elected parliament called the Diet.