The Oakland Athletics' 1990 season was their 23rd season in Oakland, California. It was also the 90th season in franchise history. The team finished first in the American League West with a record of 103 wins 59 losses. The Athletics easily won the American League West for a third consecutive season, en route to a third consecutive AL Pennant with a four-game sweep of the Boston Red Sox. The Athletics entered the 1990 World Series as heavy favorites, but were swept by the Cincinnati Reds. Neither team has reached the World Series since.