Nitzan Horowitz (Hebrew: ניצן הורוביץ; born 24 February 1965) is a politician and former journalist who served as Israel's Minister of Health from 2021 to 2022. A former leader of Meretz, he previously served as the chief U.S. correspondent and commentator for Channel 2 News.

He served two full terms in the Knesset (2009–2015) on the Meretz list. Before being elected to the Knesset, he was the Foreign Affairs commentator and head of the International desk at Hadashot 10, the news division of Channel 10. In 2013, he ran for mayor of Tel Aviv. In June 2019, he won the Meretz leadership election, and served as the Minister of Health. In July 2022, he announced that he would step down as Meretz's leader.

Horowitz was born in Rishon LeZion in 1965. He graduated from Tel Aviv University Law School and began working as a journalist. He supported the International Criminal Court's probe into Israel's alleged war crimes.

In his early career, he served as a military affairs reporter during the latter phase of the 1982 Lebanon war, as well as the international news editor at Army Radio from 1983 to 1987. In 1987, he began working at the Hadashot newspaper as the foreign affairs editor. In 1989, he moved to Haaretz, working as the foreign affairs editor. He served as a Haaretz correspondent in Paris between 1993 and 1998, covering the European Union, and as a Haaretz correspondent in Washington, D. C., from 1998 until 2001. After returning to Israel, Horowitz worked as a commentator and writer for Haaretz, and later served as the chief foreign affairs columnist for Channel 10.

When Hadashot 10 began broadcasting in January 2002, Horowitz established its international desk. His work there included creating documentary films following the tsunami disaster in eastern Asia and the failed search for Osama bin Laden in Afghanistan. He made regular appearances on Hadashot 10's current affairs show, London et Kirschenbaum, for which he provided reports and analysis of global news.

In 2008, Horowitz created and directed a documentary series for Channel 10, titled WORLD: The Next Generation – Nitzan Horowitz in search of tomorrow. The series followed major trends that could shape the future of the world in the coming decades, including the ageing crisis, urban sustainability, immigration, construction and industrial development in China, and the high-technology revolution in India.

Horowitz served as a board member of the Association for Civil Rights in Israel. He was also active in environmental issues; in 2007, he received the Pratt Prize for Environmental Journalism.

In December 2008, he resigned from Channel 10 and became a Meretz candidate in the 2009 legislative elections. In the party primaries, he gained the third slot on the joint list of the New Movement and Meretz. He said: "My goal is to continue to do what I have been talking about over the past years, from protecting the seashore to promoting more sophisticated, non-polluting public transportation." Meretz won three seats in the elections, making Horowitz the second openly gay Knesset member in Israeli history, and the only openly gay member of the eighteenth Knesset. The first, Uzi Even, had also been a member of Meretz. On 16 February 2009, he announced a plan to bring to the Knesset a bill that would allow marriages or civil unions between two partners, regardless of their religion, ethnic background, or gender. Before being sworn into the Knesset, he was told to annul his Polish citizenship, which he had obtained due to his father's origins and had used as a journalist to enter countries that Israelis have difficulty entering.