Truro was the name of a parliamentary constituency in Cornwall represented in the House of Commons of England and later of Great Britain from 1295 until 1800, then in the Parliament of the United Kingdom from 1801 to 1918 and finally from 1950 to 1997. Until 1885 it was a parliamentary borough, electing two members of parliament (MPs) by the plurality-at-large system of election; the name was then transferred to the surrounding county constituency, which elected a single Member by the first past the post system. In 1997, although there had been no changes to its boundaries, it was renamed as Truro and St Austell, reflecting the fact that St Austell by then had a larger population than Truro.

Truro is a cathedral city and civil parish in Cornwall, England, United Kingdom. It is Cornwall's county town, sole city and a centre for administration, leisure and retail trading. Its population was 18,766 in the 2011 census. People of Truro can be called Truronians. It grew as a trade centre through its port and as a stannary town for tin mining. It became mainland Britain's southernmost city in 1876, with the founding of the Diocese of Truro. It is home to Cornwall Council, the Royal Cornwall Museum, Truro Cathedral, the Hall for Cornwall and Cornwall's Courts of Justice.