Charles Zentai (born Károly Steiner; October 8, 1921 – December 13, 2017) was a Hungarian-born resident of Australia accused of a Holocaust-related war crime. He resided in Perth, Western Australia for many years after living in the American- and French-occupied zones of post-World War II Germany.

He was on the Simon Wiesenthal Center's list of most wanted Nazi war criminals until 2013.

Zentai, who denied the charges against him, was serving in the Hungarian Army as a warrant officer at the time he was accused of having murdered Péter Balázs, an 18-year-old Jewish man, in November 1944. According to witnesses, Balázs was not wearing his yellow star on the train, a crime punishable by death in German-occupied Hungary at the time. Zentai allegedly took him to an army barracks, beat him to death, and threw his body into the Danube.

Zentai was tracked down by The Simon Wiesenthal Center, which also headed the effort to extradite him to Hungary to stand trial before a military tribunal. Efraim Zuroff, director of the Simon Wiesenthal Center, presented the allegations against Zentai to Hungarian prosecutors.

Zentai was arrested on 8 July 2005 by the Australian Federal Police to await an extradition hearing. His family said at the time that the 86-year-old widower had heart disease and peripheral neuropathy, and would not survive the trip to Hungary.

In early 2007, a magistrate found that he should return to Hungary. Zentai appealed against the extradition to the Federal Court of Australia, which on 16 April 2007 dismissed the appeal.

An appeal to the High Court in 2008 was also dismissed. Simon Wiesenthal Center director Efraim Zuroff said he was very pleased that Zentai's appeals had been rejected and that "the extradition process can finally proceed."

On 1 October 2007, new evidence came to light: a testimony by Zentai's military commander which was used at a trial in the Budapest People's Court in February 1948. This commander blamed a fellow soldier who was later convicted.