The 2021 Stardom Cinderella Tournament (2021スターダムシンデレラトーナメント, Sutādamushindereratōnamento 2021), was a professional wrestling single-elimination tournament promoted by World Wonder Ring Stardom which is going to take place beginning with April 10 and culminating on May 29 in the Ota City General Gymnasium. The tournament is expanding out of the normal single night format to instead be determined over two separate dates with a limited attendance due in part to the ongoing COVID-19 pandemic at the time. The tournament winner is awarded a wish that has prompted opportunities for the championship of their choice. Night 2 was postponed due to the Japanese government announcing a state of emergency for Tokyo lasting from April 25 until May 11. The rest of the tournament was rescheduled to May 1