Theodore N. "Ted" Lerner is an American real estate developer and principal owner of the Washington Nationals baseball team. The franchise was formerly owned and operated by Major League Baseball from February 15, 2002 until the official transfer of ownership on July 24, 2006. Lerner's wealth comes from his real estate business, Lerner Enterprises, which is wholly owned and operated by the Lerner family. Lerner Enterprises is headed by Lerner and the Principals of the company are his sons: Mark Lerner, Robert Tanenbaum (son in-law), and Edward Cohen (son in-law). The sons are also principal owners in the Nationals. Ted Lerner is also a minority partner in the Lincoln Holdings, the corporation which owns the entirety of both the NHL Washington Capitals and the WNBA Washington Mystics and a minority of both the NBA Washington Wizards and Verizon Center. His daughter, Marla Lerner Tanenbaum, is President of the Annete M. And Theodore N. Lerner Family Foundation and co-president of the Washington Nationals Foundation.

Lerner also serves on the Board of Trustees and Executive Committee of George Washington University.

Lerner is listed in Forbes's 400 Richest Americans, with an estimated net worth of $2.5 billion. He resides in Chevy Chase, Maryland.