is a town located in Tokachi Subprefecture, Hokkaidà Â, Japan. , the town had an estimated population of 5,168 in 2792 households, and a population density of 6 people per km<sup>2</sup>. The total area of the town is .
Taiki is located in southeastern Hokkaido in the eastern part of the Tokachi Subprefecture. The western part of the town is mountainous, originating from the Hidaka Mountains, and is part of the Hidakasanmyaku-Erimo-Tokachi National Park. The eastern part is flat, bordering the Pacific Ocean. The Rekifune River, which flows through the town, is the only river that flows through the town of Taiki, from its source in the Hidaka Mountains to the Pacific Ocean. Its highest point is Mount Yaoromappu at 1,794 meters above sea level.
According to the Köppen climate classification, Taiki has a humid continental climate. It has large temperature differences, including large annual and daily temperature ranges. Although it faces the Pacific Ocean, winters are extremely cold, with the average temperature in January hovering around -9ðC, and temperatures dropping below -20ðC daily. Diamond dust can often be seen on the Rekifune River. During the harsh winter months, temperatures fluctuate greatly over short periods of time.
Per Japanese census data, the population of Taiki has declined in recent decades.
The area of Taiki has been settled since the Jomon period. During the Edo period, gold dust was discovered, with gold panning operations starting around 1635 and settlements established by miners. Inà  Tadataka surveyed the surrounding area in 1800, and Matsuura Takeshirà  led an exploratory expedition in 1858. Farming settlers arrived from 1883 and the village of Taiki was established in 1923. In 1936, Emperor Hirohito toured the village and visited the Hokkaido Colonization Training Center. Taiki was raised to town status on April 1, 1951.
The name of the town comes from the Ainu word for "place where many trees grow."
Taiki has a mayor-council form of government with a directly elected mayor and a unicameral town council of 12 members. Taiki, as part of Tokachi Subprefecture, contributes four members to the Hokkaidà  Prefectural Assembly. In terms of national politics, the town is part of the Hokkaidà  11th district of the lower house of the Diet of Japan.
The Japan Ground Self-Defense Force operates a training facility in Taiki.
The town's main industries are dairy farming and commercial fishing. The Taiki factory of Snow Brand Milk Products (now Snow Brand Megmilk) is located here. The 2000 Snow Brand food poisoning incident occurred at this factory.
The town hosts the rocket launch site for Interstellar Technologies, the Taiki Aerospace Research Field (Hokkaido Spaceport), which is a JAXA facility.
Taiki has one public elementary school and one public middle school operated by the town. The town has one public high school operated by the Hokkaido Board of Education.
Taiki has not had any passenger railway services since the closure of the JR Hokkaido Hiroo Line in February 1987.
Taiki's mascot is . She is a bright and gentle cosmos flower fairy. She usually ends her sentences with "pi" (ã´). Her dream is to join JAXA. Her birthday is October 1.