Caitlin Joan Halligan (born December 14, 1966) is an American lawyer who has served as an associate judge of the New York Court of Appeals since April 2023.

in history from Princeton University in 1988 after completing a 123-page long senior thesis titled "Origins and Development of Labor Radicalism in Pullman, Illinois, 1881–1894.

[4][8] After leaving the Solicitor General's office in 2007, Halligan joined the law firm Weil, Gotshal & Manges to head up its appellate practice.

[10] In early 2010, Halligan left Weil Gotshal to join the Manhattan district attorney's office as its general counsel.

[9][11] In March 2014, Halligan joined Gibson Dunn in New York as one of the firm's Appellate & Constitutional Law Practice Group leaders.

[12] Halligan represented Chevron in a landmark climate case against Steven Donziger using the civil provisions of RICO law to shield corporations from having to pay environmental damages.

[14] On May 26, 2010, legal blogger Ed Whelan reported that President Obama has placed Halligan on "the inside track" to be nominated to one of two vacancies on the United States Court of Appeals for the District of Columbia Circuit.

[26][27] According to Senator Charles E. Grassley, one objection of Republicans to the nominee was based on the legal theory she advanced while Solicitor General of New York, which was that "gun manufacturers, wholesalers and retailers contributed to a 'public nuisance' of illegal handguns in the state.

[29] Halligan was one of seven candidates under consideration for appointment to the New York Court of Appeals after the retirement of Judge Paul Feinman on March 23, 2021.

Halligan married Marc C. Falcone, the son of former New York Times food critic, Mimi Sheraton, in a civil ceremony on January 22, 1999.