Jennifer Gillian Newstead is an American attorney who served as the Legal Adviser of the Department of State.

Prior to that, she was a partner at the large corporate law firm Davis Polk & Wardwell.

[3] A graduate of Harvard University (1991) and Yale Law School (1994), Newstead clerked for Justice Stephen Breyer of the Supreme Court of the United States and Judge Laurence Silberman of the United States Court of Appeals for the District of Columbia Circuit.

[4][5] She was also General Counsel of the Office of Management and Budget, Principal Deputy Assistant Attorney General at the United States Department of Justice's Office of Legal Policy, and Associate Counsel to the President of the United States.

[15] In 2018, Jennifer G. Newstead represented the United States as Agent, Counsel, and Advocate in the case Alleged violations of the 1955 Treaty of Amity, Economic Relations, and Consular Rights (Islamic Republic of Iran v. United States of America) before the International Court of Justice.