The men's 50 metre backstroke S5 event at the 2020 Paralympic Games took place on 30 August 2021, at the Tokyo Aquatics Centre.

Heats The swimmers with the top eight times, regardless of heat, advanced to the final.

Rank Heat Lane Name Nationality Time Notes 1 1 5 Ruan Jingsong 33.27 , PR 2 2 5 Yaroslav Semenenko 35.07 3 1 4 Wang Lichao 36.21 4 2 4 Zheng Tao 37.15 5 2 3 Daniel de Faria Dias 37.19 6 1 3 Igor Plotnikov 37.93 7 2 6 Andrew Mullen 37.99 8 1 6 Antoni Ponce Bertran 38.57 9 2 2 Võ Thanh Tùng 40.07 10 1 2 Kaede Hinata 41.97 11 2 7 Beytullah Eroğlu 41.99 12 2 1 Siyazbek Daliyev 42.61 13 2 8 Dmitrii Cherniaev 42.99 14 1 1 Artur Kubasov 43.19 15 1 7 Abbas Karimi 46.48

Final Rank Lane Name Nationality Time Notes+50m backstroke final 6 Zheng Tao 31.42 WR 4 Ruan Jingsong 32.97 3 Wang Lichao 33.38 4 5 Yaroslav Semenenko 35.05 5 2 Daniel de Faria Dias 35.99 6 7 Igor Plotnikov 37.40 7 1 Andrew Mullen 37.96 8 8 Antoni Ponce Bertran 38.42

References