Dusit (Thai: ดุสิต, pronounced [dù(ʔ).sìt]) is one of the 50 districts (khet) of Bangkok, Thailand.

This included the Vimanmek Mansion which was constructed in 1900 completely out of teak, and was used as a royal palace for a short time, but was abandoned in 1908.

The construction of both Dusit Palace and Ratchadamnoen Avenue allowed and encouraged the expansion of Bangkok outside its city walls and the traditional confines of the Rattanakosin area.

The avenue extended from the palace, starting in front of the Ananta Samakhom Throne Hall and the Royal Plaza southwards along the Makawan Rangsant and Phanfah Lielas Bridges then westward across the Phanbipob Liela Bridge, then south again long the Sanam Luang to the Grand Palace.

Yearly events include commencements of many universities in Bangkok, and the Red Cross Fair which takes place for nine days from the end of March to the first week of April.

Additionally, it is also home to several military camps: 1st Cavalry Regiment, King's Guard; 4th Cavalry Division, King's Guard; 1st Field Artillery Battalion, King's Guard; Air Defense Artillery Division; Department of Army Transportation; Army Ordnance Department; Army Ordnance Learning Center; Command And General Staff College; and some parts of Royal Thai Air Force (RTAF) such as the Directorate of Aeronautical Engineering.

From 1974 the legislature moved to a purposefully built Parliament House (next to the Dusit Palace complex) and met there until 2018.

The Sam Sen Railway Station of the SRT is on the border of Dusit and Phaya Thai Districts.