Rangsit (Thai: รังสิต, pronounced [rāŋ.sìt]) is a city and neighbourhood in Pathum Thani Province, Thailand.

Rangsit is a metropolitan city that supports the expansion of Bangkok in the north.

Rangsit has become a departure point for travel to provinces in north, northeast, and eastern Thailand.

Rangsit is the home of Rangsit University and Rangsit campus of Thammasat University[1] In the past, the area of Rangsit was a vast field, covering the area from the north of Bangkok, Pathum Thani to Saraburi and the east side of the Chao Phraya River was called "Thung Luang" (ทุ่งหลวง, refers to large field), with an area of approximately 2,000 km² (about 772 mi²).

Until the reign of King Chulalongkorn (Rama V) in middle Rattanakosin period, Thailand's first irrigation canal was canalized and passed through this area, it was called "Khlong Rangsit" in honour to his son, Prince Rangsit Prayurasakdi, Prince of Chainat.