Parliament Street is a 50m long street in the city of Exeter, Devon, England. It links the High Street to Waterbeer Street and dates from the 14th century. At about 0.64m at its narrowest and approximately 1.22m at its widest, it has been claimed to be the world's narrowest street, although this title actually belongs to the Spreuerhofstraße in Reutlingen, Germany.
It was formerly called Small Lane and was renamed when Parliament was derided by the city council for passing the 1832 Reform Bill. In 1836 the residents of Waterbeer Street subscribed £130 to have Parliament Street widened, but nothing was done about this.