Onyx Dornelles Lorenzoni (born 3 October 1954) is a Brazilian politician, businessman and veterinarian. He has been Minister of Citizenship since 2020. He is a member of the Democrats (DEM). He was also Chief of Staff of the Presidency under Jair Bolsonaro from 2019 to 2020. He served as a Federal Deputy for Rio Grande do Sul from 2003 to 2019.