The attack on Thomazia Montoro State School (Portuguese: Ataque à Escola Estadual Thomazia Montoro) or nationally known as São Paulo school stabbing (Portuguese: Esfaqueamento em escola de São Paulo) was a school stabbing that occurred on 27 March 2023 at the Thomazia Montoro State School in the Vila Sônia district of São Paulo, Brazil. A 13-year-old male student attacked teachers and classmates with a kitchen knife, killing one teacher, 71-year-old Elisabeth Tenreiro, and injuring five others.
The attacker was detained by police shortly after the incident. Authorities reported that the motive remained under investigation. The attack prompted widespread public debate in Brazil regarding school safety, bullying, and the spread of violent online content.
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