St Ives is a medium-sized market town around 15 miles north-west of Cambridge, in the district of Huntingdonshire, England. It is in the administrative county of Cambridgeshire.

Previously called Slepe, its name was changed to St Ives after the body, claimed to be that of a Persian bishop, Saint Ivo, was found floating above the town. For the past 1,000 years it has been home to some of the biggest markets in the country, and in the thirteenth century it was an important entrepot port. Modern markets have, however, been dwindling.

Built on the banks of the wide, fast-flowing River Great Ouse between Huntingdon and Ely, St Ives has a famous chapel on its bridge. In recent years, St Ives has been the victim of severe yearly flooding during winter. However, property development on the main flood plain continues, risking more severe floods in the future.

St Ives has one main secondary school (St Ivo), 3 primary schools (Thorndown, Wheatfields and Westfield, which was recently named outstanding by OFSTED), 1 fire station, 1 police station and 1 bus station shared between a population of around 15,000 in 1991. There used to be a train between St Ives and Cambridge, but this closed during the 20th century.

St Ives has a successful rugby club. The rugby club's junior side has been very successful, bringing home the first County Championship trophy in 2003. The club is just on the outskirts of St Ives, just off Somersham Road. St Ives is most famous for the nursery rhyme and riddle As I Was Going to St Ives.