Sanford "Sandy" Koufax (pronounced /ˈkoʊfæks/) (born Sanford Braun, on December 30, 1935) is an American left-handed former pitcher in Major League Baseball who played his entire career for the Brooklyn/Los Angeles Dodgers, from 1955 to 1966.

Koufax's career peaked with a run of six outstanding seasons from 1961 to 1966, before arthritis ended his career at age 30. He was named the National League's Most Valuable Player in 1963, and won the 1963, 1965, and 1966 Cy Young Awards by unanimous votes, all during the period when only one pitcher was chosen per season and is the first 3-time Cy Young winner in baseball history. In each of his Cy Young seasons, Koufax won the pitcher's triple crown by leading the NL in wins, strikeouts, and earned run average. Koufax's totals would also have led the American League in those seasons.

Koufax was the first major leaguer to pitch four no-hitters (including a perfect game). Despite his comparatively short career, Koufax's 2,396 career strikeouts ranked 7th in history as of his retirement, trailing only Warren Spahn (2,583) among left-handers. Retiring at the peak of his career, he became, at age 36 and 20 days, the youngest player ever elected to the Baseball Hall of Fame.