Dawei, formerly known as Tavoy, is a city in south-eastern Myanmar and is the capital of the Tanintharyi Region, formerly known as the Tenasserim Division, on the eastern bank of the Dawei River. The city is about 614.3 km (381.7 mi) southeast of Yangon. Its population (2014 estimate) is 146,964. Dawei is a port at the head of the Dawei River estuary, 30 km (18.6 mi). from the Andaman Sea. As a result, the city is prone to flooding during the monsoon season. Dawei People is also the name of one of Myanmar's 135 ethnic minorities.

Dawei derives from the Mon language term hawai (Mon: ထဝဲါ; /həwai/), which means 'to sit cross-legged', in reference to the Buddha's sitting posture on the palin (throne).

The area around the Dawei River estuary has been inhabited for centuries by Dawei, Mon, Kayin, and Thai mariners.

As the ancient site, Sagara City, old Dawei, which is approximately 6 miles north of the present city, has so many traces of Pyu culture, it was recognized as one of the province capitals in the ancient Pyu era. The evidence of burial urns, beads, coins and other features of Pyu culture have been excavated in the area by the Department of Archaeology and National Museum, Myanmar.

From the 11th to the 13th centuries, Dawei was part of the Pagan Empire. From 1287 to 1564, Dawei became part of the Sukhothai Kingdom and its successor, the Ayutthaya Kingdom (Siam). From 1564 to 1594, Dawei was part of the Toungoo Kingdom of Burma. Siam temporarily regained the city between 1594 and 1614. From 1614 to the 1740s, Dawei was the southernmost city under Burmese authority and was defended by a Burmese garrison. In the late 1740s, during the Burmese civil war of 1740–1757, Dawei, along with the northern Tenasserim coast, was taken over by Siam. Burma regained the city in 1760 and extended its control over the entire Tenasserim coast, in 1765. The Tenasserim coast was ceded to the British after the First Anglo-Burmese War (1824–1826).

After independence in 1948, the city became part of the Tenasserim Division, which also included today's Mon State. In 1974, Mon State was carved out of Tenasserim and Dawei became the capital of the truncated division. In 1989, the city's English name was changed from Tavoy to Dawei, and Tenasserim became Tanintharyi.

Dawei features an extreme tropical monsoon climate (Köppen climate classification Am), similar to Sittwe further north-west. There is a substantial dry season from November to March, but in the wet season the influence of local mountains causes Dawei to receive as much as 1,300 millimetres (51 in) precipitation per month. Apart from the Chocó region of Colombia, and the area around Mount Cameroon in Africa, it is possibly the wettest lowland tropical region in the world.

Only recently was Dawei connected to the rest of Myanmar by road and rail. A transnational highway and a railway line across the Tenasserim Hills connecting Dawei and Bangkok are planned if a proposed deep water port project goes ahead. This port could significantly reduce Singapore-bound traffic when completed.