Vliet is a hamlet in the Dutch province of Utrecht. It is located about 1 km southwest of the city of Oudewater, on the south bank of the Hollandsche IJssel.
Vliet was a separate municipality between 1817 and 1846, when it became part of Haastrecht. During that time, the area was part of the province of South Holland.
According to the 19th century historian A.J. van der Aa, there was no hamlet in the area in the middle of the 19th century. There were just eight houses, with a population of about 50. The area used to be a manor, called Vliet or "Ratelesvliet", and contained a castle, Te Vliet. The castle was probably built between 1250 and 1300, and existed at least until 1515. In 1647, it was already a ruin, and nowadays just one wall still exists.