Matthew Kacsmaryk

Matthew Joseph Kacsmaryk (/kæsˈmærɪk/; born 1977) is an American lawyer who serves as a United States district judge in the United States District Court for the Northern District of Texas. He was nominated to the position by President Donald Trump in 2017 and sworn in for the position in 2019.

Conservative groups and the Texas Attorney General tend to file cases in Kacsmaryk's jurisdiction so that he is likely to hear those cases, as he reliably rules against Democratic policies and for Republican policies. His court has been hospitable to conservative lawsuits that many lawyers consider meritless. In 2023, he presided over a lawsuit regarding the Food and Drug Administration (FDA)'s approval of abortion medication mifepristone in 2000, and had issued a preliminary ruling suspending the approval of the drug, marking the first time a court tried to invalidate the approval of a drug over the FDA's objection. His injunction was lifted unanimously by the Supreme Court of the United States on June 13, 2024, restoring access to mifepristone under current FDA regulations.

Kacsmaryk previously worked for the law firm Baker Botts in 2003 to 2008, then worked as a federal prosecutor in Texas from 2008 to 2013, and then worked for the conservative Christian legal organization First Liberty Institute from 2014 to 2019.