The Royal London One-Day Cup is a fifty-over limited overs cricket competition for the England and Wales first-class counties. It began in 2014 as a replacement for the ECB 40 tournament, which ran from 2010 to 2013. In contrast to its 40-over predecessor, the number of overs per innings was set at 50 to bring the competition in line with One-Day Internationals.

The 2020 tournament was cancelled due to the COVID-19 pandemic.