Ratcliffe-on-Soar, sometimes also written Ratcliffe-upon-Soar or given as Radcliffe-on-Soar, is a village and civil parish in Nottinghamshire on the River Soar. It is part of the Rushcliffe district, and is the site of Ratcliffe-on-Soar Power Station. Nearby places are Kingston on Soar, Kegworth and Trentlock. With a population measured at 141 in the 2011 Census, and marginally increasing to 147 residents at the 2021 census, the parish is too small to have a parish council and so has a parish meeting. Although the village does not contain any shops, it has a church and a marina which is often affected by severe flooding as it built on designated floodplain, just before the Soar joins the River Trent at Trentlock.

The River Soar is a major tributary of the River Trent in the English East Midlands and is the principal river of Leicestershire. The source of the river is midway between Hinckley and Lutterworth. The river then flows north through Leicester, where it is joined by the Grand Union Canal. Continuing on through the Leicestershire Soar Valley, it passes Loughborough and Kegworth until it reaches the Trent at the county boundary. In the 18th century, the Soar was made navigable, initially between Loughborough and the Trent, and then through to Leicester. It was not until the early 19th century that it was linked by the Grand Union Canal to the wider network to the south and to London.