George Michael Steinbrenner III (born July 4, 1930) is an American billionaire businessman, and owner and the former principal executive of Major League Baseball's New York Yankees. His outspokenness and role in driving up player salaries have made him one of the sport's most controversial figures.

Steinbrenner is known as a hands-on executive, earning the nickname "The Boss". His tendency to meddle in daily on-field decisions, and to hire and fire (and sometimes re-hire) managers led then-Yankees skipper Dallas Green to give him the derisive nickname "Manager George".

During Steinbrenner's ownership since 1973, the longest in club history, the Yankees have earned 11 pennants and six World Series titles.