At the delayed 2020 Tokyo Olympics in the summer of 2021, Kenny and her team-mates took the silver medal in the team pursuit: they briefly held the world record after their ride in the first round before Germany set a faster time in the next heat and secured a place in the gold medal final against Team GB. Germany broke their world record again in the final to win the gold, finishing six seconds ahead of the British team. Kenny and Katie Archibald subsequently went on to become the first Olympic champions in the women's Madison with a dominant performance, winning 10 of the race's 12 sprints and gaining a lap on the field with 20 laps to go to secure a total of 78 points, more than twice the score of the second-placed Danish team. The win made Kenny the first British woman to win golds at three consecutive Olympics, the most successful female cyclist in Olympic history, eclipsing Leontien van Moorsel, and tied her with Charlotte Dujardin for the most Olympic medals won by a British female sportsperson. In the omnium, Kenny's medal hopes suffered a setback in the opening scratch race when she was involved in a multi-rider crash on the penultimate lap. She went on to win the tempo race but could only finish 13th in the elimination race. After the closing points race she moved up from ninth place to finish sixth in the overall standings. Kenny was subsequently selected as the flag bearer for the British team at the Games' closing ceremony.