The Thai–Lao Friendship Bridges are a series of international bridges connecting Thailand and Laos across the Mekong River, enhancing regional connectivity, trade, and tourism. As of the beginning of 2026 there are five completed bridges, with a sixth under construction.

The first Thai–Lao Friendship Bridge, opened on 8 April 1994, connects Nong Khai, Thailand, with Vientiane, Laos, spanning 1170 metres with two road lanes, footpaths, and a central railway line. It was funded by Australia with A$42 million and symbolises enduring cooperation between Thailand, Laos, and Australia. The second bridge, opened in 2006, links Mukdahan, Thailand, with Savannakhet, Laos. The third bridge, opened in 2011, connects Nakhon Phanom, Thailand, with Khammouane, Laos. The fourth bridge, opened on 11 December 2013, spans Chiang Khong, Thailand, and Houayxay, Laos, and is 630 metres long with a main span of 480 meters.

The fifth Thai–Lao Friendship Bridge, connecting Bueng Kan, Thailand, with Bolikhamxay, Laos, officially opened on 26 December 2025, after construction began in 2020 on the Thai side and 2021 on the Lao side. The bridge is 1350 metres long with an 810 metre Mekong River crossing and was built at a cost of 3.93 billion baht, with Thailand contributing 2.63 billion baht and Laos providing 1.3 billion baht via a concessional loan from Thailand’s Neighboring Countries Economic Development Cooperation Agency (NEDA). It is expected to reduce travel time between Bolikhamxay and Bueng Kan by up to three hours and forms part of the shortest land route connecting Thailand, Laos, and Vietnam.

The sixth Thai–Lao Friendship Bridge, currently under construction, will link Ubon Ratchathani, Thailand, with Salavan, Laos, and is backed by a 4.765 billion baht fund. This bridge is expected to streamline trade and transportation, particularly for goods from Thailand to southern China and from central Laos to Thailand’s Laem Chabang port.

All bridges facilitate visa checks, customs, and immigration, and include a traffic direction change point due to differing driving sides—left in Thailand and right in Laos. These bridges are integral to the Greater Mekong Subregion (GMS) and the Ayeyawady–Chao Phraya–Mekong Economic Cooperation Strategy (ACMECS), promoting regional economic integration and development.