- The Yanks win their third straight American League flag, tying the loop record.
- The Chicago Cubs win in the National League.
- The Yanks sweep the 1938 World Series.
Henry Chadwick was
inducted into the Baseball
Hall of Fame in 1938.
- The Hall of Fame inducts Pete Alexander, Alexander Cartwright, and Henry Chadwick.
- Red Ruffing wins two complete games in the 1938 World Series.
- Stan Hack of Cubs leads all Series players in BA (.471) and hits (8) -- the first member of losing team to do so.
- The Yanks have now lost a total of three games in their last six World Series appearances.
- Jimmie Foxx is the American League MVP.
- Cincinnati's Ernie Lombardi is the National League MVP.
- Lombardi is the first catcher to win a consensus bat title (Bubbles Hargrave in 1926 had less than 400 at-bats).
- Hank Greenberg hits 58 homers to lead the American League.
- Lou Gehrig has 100 or more RBI for a major league-record 13th consecutive season.
- Cincinnati's Johnny Vander Meer no-hits Boston on June 11.
- Vander Meer becomes the only pitcher in major league history to throw back-to-back no-hitters, as he blanks the Dodgers on June 15.
- Bob Feller fans modern record (since broken) 18 batters in a game.
- Feller's 240 Ks top the majors.
- The National League strikeout leader Clay Bryant of Chicago has just 135 strikeouts.
- Feller gives up a 20th-century record 208 walks.
- Feller sets teenager records for Ks, walks, starts (36), CGs (20), and innings (278).
- Cub Bill Lee leads the majors with 22 wins.
- Gabby Hartnett's homer vs. Pittsburgh on Sept. 28 puts the Cubs in first to stay.
- Cardinal Frenchy Bordagaray hits record .465 as a pinch hitter and gets 20 pinch hits.
- Reds rise from last in 1937 to fourth in 1938 in first year under Bill McKechnie.
- The National League wins the All-Star Game 4-1 at Cincinnati.
- The Phils move to Shibe Park on July 4.
- Gehrig hits the last of his career record 23 grandslams.
- Greenberg hits a record 39 homers at home.
- On April 19, Dodger Ernie Koy and Phillie Heinie Mueller each homer in their first major league at-bat in same game.
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