Bang Rak is a khwaeng (subdistrict) and historic neighbourhood in Bangkok's Bang Rak District. It lies between the Chao Phraya River and Charoen Krung Road, and was home to communities of European expatriates who settled in the area mostly during the second half of the 19th century as Siam opened up to the West. Among them were the Portuguese, French and British, whose embassies occupied extensive grounds in the area, Danes who founded shipping companies as well as the historic Oriental Hotel, and Catholic missionaries who established some of the first schools in the country on the grounds surrounding Assumption Cathedral.

Bang Rak is one of the fifty districts (khet) of Bangkok, Thailand. It lies on the eastern bank of the Chao Phraya River, beyond Khlong Phadung Krung Kasem, which marked the old city boundary. Originating from riverside settlements dating from before the city's foundation, Bang Rak grew inland as new roads and canals were constructed through the area during the second half of the nineteenth century and the early twentieth, attracting communities of expatriates and developing into a major commercial district. Bangkok's rapid economic growth in the late twentieth century saw the areas along Si Lom and Sathon roads transformed into one of the city's main business districts, teeming with skyscrapers. The district, officially recognised at least since 1908, covers an area of 5.54 square kilometres (2.14 sq mi), and has a registered population of 48,227. Today, Bang Rak is known for the financial activity of its commercial offices, as well as its vibrant nightlife scenes. Diverse historic and religious sites, most significantly concentrated in Bang Rak Subdistrict on the waterfront, reflect the district's multicultural history.