Tonsawang, also known as Tombatu, is an Austronesian language of the northern tip of Sulawesi, Indonesia. It belongs to the Minahasan branch of the Philippine languages.

According to linguist James Sneddon, the language is "one of the most isolated languages", spoken in southeast Minahasa, while linguist Robert Blust situated it, along with the others of the Minahasan group, near Lake Tondano, "in the northern peninsula of Sulawesi".