Siri Rat (also spelled Siriraj, Thai: ศิริราช) is one of the 180 sub-districts (khwaeng) of Bangkok, Thailand, covering the area around Siriraj Hospital, located on the southern rim of Khlong (canal) Bangkok Noi mouth to the western bank of the Chao Phraya River in Bangkok Noi District.

The major features in Siri Rat are the Faculty of Medicine Siriraj Hospital, Mahidol University, the oldest government hospital and the largest medical institution of Thailand, Wang Lang ladies market and Wat Rakhang, Temple of the Bell, the major temple with many exquisite fine arts.

Outside the area just the northern rim of Khlong Bangkok Noi, there is also the National Museum of Royal Barge, where 8 important barges are preserved and displayed.

Wang Lang or Siri Rat Pier is the main pier for the area, consists of the ferry crossing-river boat service to Tha Chang and Tha Phra Chan piers to the Grand Palace, Wat Phra Kaew and Sanam Luang; and the Chao Phraya Express Boat Service to northern suburb at Nonthaburi or Bangkok downtown at Si Lom and Sathon.

There are several bus, public tuk-tuk or songthaew (public passenger pick-up vehicles) services to Taling Chan, Bangkok Yai, Charan Sanit Wong Road and Pinklao neighbourhood, and also the river-crossing bus lines through Phra Pinklao Bridge to Sanam Luang and Ratchadamnoen Road at another river side.