Elena Kagan (born April 28, 1960) is an American lawyer who serves as an associate justice of the Supreme Court of the United States. She was appointed in 2010 by President Barack Obama and is the fourth woman to serve on the Court.

Kagan was born and raised in New York City. After graduating from Princeton University, Worcester College, Oxford, and Harvard Law School, she clerked for a federal Court of Appeals judge and for Supreme Court Justice Thurgood Marshall. She began her career as a professor at the University of Chicago Law School, leaving to serve as Associate White House Counsel, and later as a policy adviser under President Bill Clinton. After a nomination to the United States Court of Appeals for the D.C. Circuit, which expired without action, she became a professor at Harvard Law School and was later named its first female dean.

In 2009, Kagan became the first female solicitor general of the United States. The following year, President Obama nominated her to the Supreme Court to fill the vacancy arising from the impending retirement of Justice John Paul Stevens. The United States Senate confirmed her nomination by a vote of 63–37. As of 2022, she is the most recent justice appointed without any prior judicial experience. She is considered part of the Court's liberal wing. She has written the majority opinion in some landmark cases, such as Cooper v. Harris, Chiafalo v. Washington, and Kisor v. Wilkie, as well as several notable dissenting opinions, such as in Rucho v. Common Cause, West Virginia v. EPA, Brnovich v. DNC, Janus v. AFSCME, and Seila Law v. CFPB.