The Bali Sea (Indonesian: Laut Bali) is the body of water north of the island of Bali and south of Kangean Island in Indonesia. The sea forms the south-west part of the Flores Sea, and the Madura Strait opens into it from the west.

The Bali Sea is sometimes grouped with Flores Sea for oceanographic purposes, however in some nautical charts, Bali Sea is written as a distinct sea for navigation. The sea has an area of 45,000 km² (17,000 sq mi) and a maximum depth of 1,590 m (5,217 ft).

The International Hydrographic Organization (IHO) defines the Bali Sea as being one of the waters of the East Indian Archipelago. The IHO defines its limits as follows:

On the North. A line from the Western Paternoster Island to the East point of Sepandjang and thence through this island to the West point of Gedeh Bay on the South coast of Kangean (7°01′S 115°18′E / 7.017°S 115.3°E / -7.017; 115.3).

On the West. A line from the West point of Gedeh Bay, Kangean Island, to Tg Sedano, the Northeast extreme of Java and down the East coast to Tg Bantenan, the Southeast extreme of the island.

Bali is an Indonesian island located in the westernmost end of the Lesser Sunda Islands, lying between Java to the west and Lombok to the east. It is one of the country's 33 provinces with the provincial capital at Denpasar towards the south of the island. The province covers a few small neighbouring islands as well as the isle of Bali.

With a population recorded as 3,891,428 in the 2010 census, the island is home to most of Indonesia's Hindu minority. In the 2000 census about 92.29% of Bali's population adhered to Balinese Hinduism while most of the remainder follow Islam. It is also the largest tourist destination in the country and is renowned for its highly developed arts, including traditional and modern dance, sculpture, painting, leather, metalworking, and music. Bali, a tourist haven for decades, has seen a further surge in tourist numbers in recent years.

Bali was inhabited by around 2000 BC by Austronesian peoples who migrated originally from Taiwan through Maritime Southeast Asia. Culturally and linguistically, the Balinese are thus closely related to the peoples of the Indonesian archipelago, Malaysia, the Philippines, and Oceania. Stone tools dating from this time have been found near the village of Cekik in the island's west.