Tammy Murphy (née Snyder; born August 5, 1965) is an American political figure and activist who was the first lady of New Jersey from 2018 to 2026. A member of the Democratic Party, she was an unsuccessful candidate in the 2024 United States Senate election in New Jersey to replace Bob Menendez. She co-owns the professional women's soccer team Gotham FC with her husband, New Jersey governor Phil Murphy, and chairs the organization.

Tammy Murphy was born Tammy Snyder in Virginia Beach, Virginia. Her father, Edward, and mother, Jean, a British immigrant and former fashion model, owned what New York magazine described as an "empire" of car dealerships. Edward Snyder was Jewish.

Murphy attended boarding school at Phillips Academy Andover, graduating in 1983. She graduated from the University of Virginia in 1987 with a Bachelor of Arts in Communications and English.

After graduating college, Murphy went to work in finance as an analyst for Goldman Sachs in the real estate department from 1987 to 1989. She left Goldman at the age of 24 to work mainly at Investcorp in London for three years, from 1990 to 1993, but quit at the age of 27 "to marry Mr. Murphy in 1994 and move to Frankfurt, Germany, where he was working at the time." She has not "worked outside the home" since marrying. As of 2023, Murphy "describes herself as a homemaker on tax forms."

Murphy and her husband are the founders and part owners of Gotham FC, a professional women's soccer team. They founded the team in 2007. Murphy serves as the club's chair.

In 2018, media outlets reported that the team was "plagued by poor housing, subpar facilities, and mismanagement." In 2024, Politico reported that Murphy had been criticized because "the women's soccer team she and her husband co-own, Gotham FC, was found [...] to have provided poor living and playing conditions, prompting Murphy to become more hands-on with the club."

Responding to the women's soccer team allegations, Murphy said that she and her husband were unaware of the players' conditions and allegations of abuse. After she became aware of the report detailing these allegations, Murphy "took a more active role in the team, renaming it Gotham FC and moving the players to Red Bull Arena in Harrison commencing a turnaround that culminated in the team's 2023 championship victory."

Murphy has sat on the boards of her children's schools, the private Rumson Country Day School and the boarding school Phillips Andover, as well as on that of the Count Basie Center for the Arts, among others. While her husband was working as the United States ambassador to Germany from 2009 through 2013, Murphy, according to her biography, chaired meetings, gave speeches, and hosted meals and receptions to help further develop the German-American relationship. Murphy was appointed to the University of Virginia Board of Visitors in 2015.