Mark Brnovich (born 1966) is an American attorney and politician who was the 26th Attorney General of Arizona from 2015 to 2023. A member of the Republican Party, he was an unsuccessful candidate for its nomination in the 2022 U.S. Senate election in Arizona.

Brnovich was born in Detroit, Michigan in 1966. His parents were Serbs who had immigrated from former Yugoslavia, his father from Montenegro, and his mother from Split, Croatia. He has said that his mother emigrated to the United States to escape communism. Brnovich and his family moved to Arizona when he was young. They are members of a local Serbian Orthodox parish in Phoenix.

Brnovich earned a bachelor's degree in political science from Arizona State University and a Juris Doctor from the University of San Diego School of Law. While at Arizona State, Brnovich was a member of Sigma Pi fraternity.

Brnovich served as a Command Staff Judge Advocate with the Army National Guard. He has worked as the Director of the Center for Constitutional Government at the Goldwater Institute, as Assistant U.S. Attorney for the District of Arizona, as a prosecutor with the Maricopa County Attorney's Office, and as Assistant Attorney General of Arizona. From 2005 to 2007, Brnovich was a lobbyist for the Corrections Corporation of America. He was appointed the director of the Arizona Department of Gaming in 2009 and kept the position through 2013.

Brnovich resigned from the Department of Gaming in 2013 to run for Attorney General of Arizona in the 2014 election. He defeated incumbent Tom Horne in the August Republican Party primary election and Felecia Rotellini in the general election. He was inaugurated on January 5, 2015.

In August 2016, the Arizona Attorney General's office took action in the Maricopa County Superior Court and filed to intervene in over 1,000 lawsuits initiated by an advocacy group that flooded courts with duplicative disability access lawsuits targeting mostly small businesses. By intervening, the Attorney General's office made itself a part of the cases and argued that the plaintiffs' group, Advocates for Individuals with Disabilities, exceeded its legal authority and was not allowed to collect fees on these types of lawsuits.

In September 2016, a judge agreed to allow the Attorney General's office to intervene and consolidated the cases while also preventing Advocates for Individuals with Disabilities from filing new lawsuits. In December 2016, the office filed a motion to dismiss the lawsuits and a judge granted the request in February 2017, dismissing over 1,000 of the lawsuits. After the ruling, Brnovich said "Arizona is not going to tolerate serial litigators who try to shake down small hardworking businesses by exploiting the disability community."

As attorney general, Brnovich undertook efforts in the area of consumer protection and advocacy, including the opioid epidemic. Notable consumer settlements included a $4.65 million settlement in 2017 with Theranos, Inc. to resolve an Arizona Consumer Fraud Act case over allegations that the company's advertisements misrepresented the accuracy and reliability of more than 1.5 million blood tests sold between 2013 and 2016. Under the settlement, the 76,000 Arizonans who received a blood test over that time period received a full refund (averaging $60.92) and Theranos was also banned from owning, operating, or directing a lab in Arizona for two years.