Tomohon is a city in North Sulawesi Province, in central Indonesia. It covers an area of 147.21 km2, and had a population of 91,553 at the 2010 Census, rising to 100,587 at the 2020 Census. The official estimate as at mid 2023 was 103,072. Tomohon was formerly a part of the Minahasa Regency in North Sulawesi, but it officially became a city separated from the Regency, inaugurated on 4 August 2003.

North Sulawesi is a province of Indonesia. It is mainly located on the Minahasa Peninsula of the island of Sulawesi, south of the Philippines and southeast of Sabah, Malaysia, but also includes various small archipelagoes situated between the Minahasa Peninsula and the southern Philippines. It borders the Philippine province of Davao Occidental and Soccsksargen regions of the Philippines to the north, the Maluku Sea to the east, Gorontalo and Celebes Sea to the west and the Gulf of Tomini to the southwest. The province's furthest extent, the outlying and isolated island of Miangas to its north, is the northernmost island of Indonesia.