The Gulf of Tomini (Indonesian: Teluk Tomini) is a gulf near the island of Sulawesi, Indonesia.
It is bounded on its north and west sides by the Minahassa Peninsula and on the south side by the East Peninsula, Sulawesi.
The Togian Islands sit in the centre of the gulf.
To the east it is open to the Molucca Sea.
The International Hydrographic Organization (IHO) defines the Gulf of Tomini as being one of the waters of the East Indian Archipelago. The IHO defines its eastern limit as "The Western limit of Molukka Sea [sic]", which is defined as "Tg. Pasir Pandjang (0°39′S 123°25′E / 0.650°S 123.417°E / -0.650; 123.417) and across to Tg. Tombalilatoe (123°21'E) on the opposite coast".