Antonio Tirol Carpio (Tagalog pronunciation: [anˈtɔnjo ˈkaɾpjo]; born October 26, 1949) is a former associate justice of the Supreme Court of the Philippines.

During the presidency of Joseph Estrada, Carpio returned to private practice and penned a regular opinion column published in the Philippine Daily Inquirer.

Carpio was the first appointee of President Gloria Macapagal Arroyo to the Supreme Court of the Philippines after her assumption into office in January 2001.

Carpio received the Presidential Medal of Merit from President Fidel Ramos in 1998 for his "distinguished and exemplary service" to the country, the Outstanding Achievement in Law Award from the Ateneo de Manila Alumni Association, and an honorary Doctorate of Laws from the Ateneo de Davao University.

He assumed the post after his predecessor, Renato Corona, was convicted by the Senate impeachment court for his failure to disclose in his Statement of Assets, Liabilities, and Net Worth, dollar accounts that led to his removal in office, a penalty authorized by the 1987 Constitution.

[10] He assumed the post again on March 1, 2018, as Chief Justice Maria Lourdes Sereno filed an indefinite leave in the midst of impeachment proceedings against her.

In October, 2019, CJ Artemio Panganiban summarized Carpio's Judicial and Bar Council nomination for chances to be appointed Chief Justice of the Philippines.

In the just concluded Malacañang interview, Benigno Aquino III later phoned him that he "could not appoint me because some of his key Senate allies and three prominent business leaders opposed my promotion."

Third, was after the Quo warranto petition against Maria Lourdes Sereno removal on May 11, 2018, considering he wrote the legal opinion that "the Court had no power to oust its members".

Fifth, CJ Panganiban stated being informed by Lucio Singh that Duterte would appoint Carpio for a day or two before his compulsory retirement.

"[17] In 2015, the Philippine Department of Foreign Affairs sponsored Carpio on a world lecture tour on the South China Sea dispute.

Carpio presented the Philippines' historical and legal case on the dispute before think tanks and universities in 30 cities covering 17 countries.

The book collects over 140 lectures and speeches by Carpio "intended to convince the Chinese people that the nine-dashed line has no legal or historical basis."