Frank Ruben Jimenez (born November 8, 1964) became the 21st General Counsel of the U.S. Department of the Navy on September 25, 2006, following his nomination by George W. Bush and confirmation by the United States Senate.

Jimenez served at the Navy after the change in administrations on January 20, 2009 until April 30, 2009 when he resigned to become Vice President and General Counsel at ITT Corporation.

He is the younger brother of Marcos Daniel Jimenez, former United States Attorney for the Southern District of Florida, in charge of 230 federal prosecutors.

Before his career in government, Jimenez practiced at the Miami law firm of Steel Hector and Davis LLP, specializing in complex commercial litigation and white collar criminal defense, including federal class action, antitrust and product liability litigation, and representation of clients under federal grand jury and agency investigation.

Previously, he served a one-year clerkship in the chambers of Judge Pamela Ann Rymer of the U.S. Court of Appeals for the Ninth Circuit in Pasadena, California.

Jimenez arrived in Washington in 2002 from Florida, where he served for nearly four years in the Executive Office of Governor Jeb Bush, beginning with his gubernatorial transition in 1998.