The women's lightweight boxing event at the 2020 Summer Olympics took place between 27 July and 8 August 2021 at the Ryōgoku Kokugikan. 20 boxers from 20 nations competed. Kellie Harrington from Ireland won the gold medal, after defeating Brazil's Beatriz Ferreira in the final. Bronze medals were awarded to both semi-final losers: Sudaporn Seesondee from Thailand and Mira Potkonen from Finland.