Andrew L. Stern (born November 22, 1950) is the former president of the Service Employees International Union, and now serves as its President Emeritus.

Stern has been a senior fellow at Georgetown University, Columbia University, and is now a Senior Fellow at the Economic Security Project.

He is the author of two books, A Country That Works (2006), and Raising the Floor: How a Universal Basic Income Can Renew Our Economy and Rebuild the American Dream (2016).

Andy Stern grew up in West Orange, New Jersey, where his father was a lawyer and his mother worked both at home and in healthcare. Stern graduated from West Orange High School in 1968. He began college as a business major at the University of Pennsylvania's Wharton School of Business, but ultimately graduated in 1971 with a BA in education and urban planning. Stern began his career as a welfare caseworker and member of the SEIU Local 668 in 1973, eventually being elected president in 1977 of his Pennsylvania local. In 1980, he was elected to SEIU’s International Executive Board, as the youngest member in its history, and in 1984 the union's then-president John Sweeney put him in charge of SEIU’s organizing efforts.

In 1996, Stern was elected to the presidency of the union in a hotly contested election. He led a major restructuring of the union to spending nearly 50% of its resources on organizing. In 1999 SEIU won the largest union election since 1935 for 74,000 LA home care workers. By 2000 SEIU had become the largest union in the AFL-CIO, and the fastest growing union in the world. It launched major North American campaigns “Justice for Janitors”, “Stand for Security”, “There’s No Place Like Home”, and set up offices around the world to lead transnational global accountability efforts for Sodexo, Securitas, and ISS. As a result of these efforts, SEIU grew 1,200,000 members under his leadership.

Stern was both a progressive and practical labor leader as Al Hunt profiled in his WSJ column, "He (Stern) is a powerhouse in the labor movement and American politics, and one of a new breed of labor leaders determined to energize the movement." The Washington Business Journal profile was headlined "Militant but pragmatic labor leader wants a vibrant D.C."

After launching a national debate aimed at uniting the nine out of ten American workers who have no organization at work, SEIU, along with the Teamsters, announced on July 25, 2005 that they were disaffiliating from the AFL-CIO. Stern led SEIU out of the AFL-CIO and founded Change to Win, a six-million-member federation of seven major unions "dedicated to giving workers a voice at their jobs."

During the years of Stern's leadership, the SEIU became the largest political action committee in the United States, and funneled vast amounts of financing to the Democratic Party and its candidates, far outnumbering the contributions of other unions during his last two election cycles. SEIU contributed $65 million to the 2004 presidential campaign of John Kerry. In 2008 SEIU sponsored with the Center for American Progress (CAP), the first Presidential election forum, on health care, and required all candidates seeking the union's endorsement to “Walk A Day In My Shoes” including Senator Barack Obama as a home care worker Hillary Clinton as a nurse, and Joe Biden as a school maintenance worker, and have a plan for universal healthcare. The union spent another $85 million on Democratic candidates in 2008; $60 million going toward the election of President Barack Obama, with a significant chunk of that money funding door-to-door canvassing and other GOTV efforts, as well as voter registration.