1966 Major League Baseball season

The 1966 Major League Baseball season was contested from April to October 1966. The Braves played their inaugural season in Atlanta, following their relocation from Milwaukee. Three teams played the 1966 season in new stadiums. On April 12, the Braves ushered in Atlanta Stadium with the Pittsburgh Pirates taking a 3–2 win in 13 innings. One week later, Anaheim Stadium opened with the California Angels losing to the Chicago White Sox, 3–1 in the Angels' debut in Orange County. On May 8, the St. Louis Cardinals closed out Busch Stadium I with a 10–5 loss to the San Francisco Giants before opening the new Busch Memorial Stadium four days later with a 4–3 win in 12 innings over the Atlanta Braves.

In the World Series the Baltimore Orioles defeated the Los Angeles Dodgers 4 games to 0.