MarÃÂa Trinidad Steinert Herrera (born 7 August 1970) is a Chilean lawyer and prosecutor who served as Regional Prosecutor (Fiscal Regional) of Tarapacá from February 2024 until her resignation in January 2026.
In January 2026, President-elect José Antonio Kast named her as future minister of public security (Ministra de Seguridad Pública) in his incoming cabinet, ahead of his inauguration on 11 March 2026.
Her work at the Public Ministry of Chile has focused on the prosecution of organized crime and related offences, including cases linked to irregular migration and human trafficking in northern Chile.
Steinert studied law at the Central University of Chile and qualified as an attorney before the Supreme Court of Chile. She later completed a master's degree in Chilean criminal procedure reform (Reforma Procesal Penal) at the same institution.
In 2021, she joined the Public Ministry in the Arica y Parinacota Region as a deputy prosecutor (fiscal adjunta), working on cases connected to irregular migration, human trafficking, and transnational organized crime.
On 16 February 2024, she assumed office as Regional Prosecutor of Tarapacá, based in Iquique.
On 20 January 2026, President-elect José Antonio Kast announced Steinert as his choice to lead the Ministry of Public Security in the government due to take office on 11 March 2026. She resigned from the Public Ministry shortly before the announcement.