Babe Ruth signs a contract to coach with the Brooklyn Dodgers. Ruth dons a Dodger uniform the next day, entertains observers with a batting demonstration, and works the third-base coaching box for the remainder of the season.
August 2 – The Brooklyn Dodgers and the St. Louis Cardinals used a yellow baseball in the first game of a doubleheader as an experiment. The two teams went back to the white ball in the second game as the Dodgers swept the doubleheader 6–2 and 9–3.
August 22 – Preacher Roe makes his major league debut for the St. Louis Cardinals. He lasts just 2.2 innings and gives up four earned runs. He doesn't pitch in the major leagues again until 1944 with the Pittsburgh Pirates.
Lou Boudreau makes his major league debut for the Cleveland Indians in an 11–5 loss to the Detroit Tigers.
The Cincinnati Reds sell Jake Mooty and Jimmy Outlaw to the Brooklyn Dodgers. Five days later (September 14), Commissioner Landis voids the deal, making both players eligible for the draft. Outlaw is drafted by the St. Louis Cardinals in the 1938 rule 5 draft on October 5, and traded to the Dodgers for Lew Krausse and cash on December 13. Brooklyn then packages him with Buddy Hassett, and send him to the Boston Bees for Ira Hutchinson and Gene Moore the same day. Mooty isn't drafted until October 3, 1939, by the Chicago Cubs from Syracuse (International).
September 10 – At the Polo Grounds, the New York Giants defeat the Brooklyn Dodgers, 20-2.
September 30 – The Chicago Cubs and St. Louis Cardinals play to a 7–7 tie. The tie breaks the Cubs' ten-game winning streak that sees them go from 3.5 games back of the Pittsburgh Pirates to first place in the National League.
October 6 – The Cubs jump out to a 1–0, then 3–2 lead against the Yankees, however, two run home runs by Frankie Crosetti and Joe DiMaggio in the eighth and ninth inning, respectively, give the Yankees the 6–3 victory.
October 8 – With two outs and no one on base, a two out rally in the fifth inning plates two runs, as the New York Yankees take game three of the World Series, 5-2.
October 9 – The New York Yankees defeat the Chicago Cubs, 8–3, in Game four of the World Series to win a record third consecutive World Championship, and seventh overall, four games to none.
December 14 – Major League Baseball teams adopt several resolutions. The National League allows the Cincinnati Reds to play their season opener one day before other teams, as a way of honoring the 100th anniversary of baseball and of the 1869 Red Stockings being the first professional team. In other news, Will Harridge is re-elected as American League president and given a 10-year term. The AL permits the Cleveland Indians and Philadelphia Athletics to play night games. Finally, MLB agree on a standard ball but disagree on increasing rosters from 23 to 25 players. Judge Landis will eventually decide on 25.
January 1 – Frank Sexton, 65, pitcher for the 1895 Boston Beaneaters of the National League.
January 12 – Dupee Shaw, 78, pitcher who played six seasons. Won 30 games and struck out 451 batters in 1884.
January 16 – Earl Clark, 30, backup outfielder who hit .291 in 293 games for the Boston Braves and St. Louis Browns from 1927 to 1934.
January 16 – Joe Sommer, 79, infielder/outfielder between 1880 and 1890, most prominently for the Baltimore Orioles of the American Association.
January 19 – Bill Everitt, 69, infielder who played from 1895 through 1901 for the Chicago Colts/Orphans and the Washington Senators.
January 20 – Herb Goodall, 67, pitcher for the 1890 Louisville Colonels of the American Association.
January 27 – Larry Battam, 61, third baseman for the 1895 New York Giants of the National League.
January 24 – Jim Mutrie, 86, manager who led New York Metropolitans to the American Association title in 1884, then won pennants in 1888–89 after moving to NY's NL franchise – which he renamed by marveling over his "Giants"; career .611 winning percentage was best of 19th century.
January 28 – Bill Hill, 63, pitcher who played from 1896 to 1899 for five different National League clubs.
January 28 – Pop Rising, 56, outfielder for the 1905 Boston Americans.
January 31 – Charlie Chech, 59, pitcher for the Cincinnati Reds, Cleveland Naps and Boston Red Sox between 1905 and 1909.
January 31 – Jim Gray, 75, infielder who played for the Pittsburgh Alleghenys/Burghers/Pirates between 1884 and 1893.
March 2 – Walter Prince, 76, first baseman who played from 1883 to 1884 for the Louisville Eclipse, Detroit Wolverines and Washington Nationals.
March 4 – Jack Taylor, 64, pitcher for the Chicago Orphans/Cubs and St. Louis Cardinals from 1898 to 1907, who won twenty or more games in four seasons, hurled 187 consecutive complete games between 1901 and 1906, and was a member of the world champion 1907 Cubs.
March 6 – Rube Lutzke, 40, third baseman for the Cleveland Indians from 1923 to 1927, who led the American League in putouts and assists in the 1923 season.
March 13 – Rube Ellis, 52, left fielder who hit .260 in 555 games for the St. Louis Cardinals from 1909 to 1912.
May 11 – Buzz Murphy, 43, outfielder who played from 1918 to 1919 with the Boston Braves and the Washington Senators.
May 21 – Sam Childs, 76, first baseman for the 1883 Columbus Buckeyes of the American Association.
May 21 – Silver King, 70, pitcher who had three 30-win seasons for the 1887–89 St. Louis Browns and another for the 1890 Chicago team in the Players' League, who is regarded as the first sidearm pitcher.
May 22 – Harry Lumley, 57, right fielder and manager who spent his entire career with the Brooklyn Superbas in the National League from 1904 to 1910, while leading the league with 18 triples and nine home runs during his rookie season.
July 27 – Milt Reed, 48, shortstop/second baseman who played between 1911 and 1914 with the Cardinals and Phillies, and for the Brooklyn Tip-Tops of the Federal League in 1915.
July 31 – Bill Carney, 64, right fielder who played briefly for the Chicago Cubs in the 1904 season.
July 31 – Doc Miller, 55, Canadian outfielder who posted a .295 average from 1910 through 1914 for the Chicago Cubs, Boston Doves/Rustlers/Braves, Philadelphia Phillies and Cincinnati Reds, while leading the National League with 192 hits in the 1912 season.
November 3 – Jerry Dorsey, 82, Canadian pitcher/outfielder for the 1884 The Baltimore Monumentals of the Union Association.
November 3 – Milt Scott, 77, first baseman who played between 1882 and 1886 for the Chicago White Stockings, Detroit Wolverines, Pittsburgh Alleghenys and Baltimore Orioles.
November 10 – Chet Spencer, 55, outfielder for the 1906 Boston Beaneaters of the National League.
November 11 – Fred Hartman, 70, third baseman who posted a .278 average and 333 RBI between 1894 and 1902 for the Pirates, Browns, Giants, White Sox and Cardinals.
November 12 – Andy Harrington, 49, pitcher who played for the Cincinnati Reds in the 1913 season.
November 14 – Les Nunamaker, 49, catcher for the Red Sox, Yankees, Browns and Indians from 1911 to 1922, who in 1914 threw out three baserunners attempting to steal in the same inning, to become the only 20th century catcher to accomplish this feat at major league level.
November 21 – Polly Wolfe, 50, backup outfielder who played in 1912 and 1914 for the Chicago White Sox.
December 3 – Guy Hecker, 82, American Association pitcher/first baseman who won the Triple Crown as a pitcher in 1884 and a batting title in 1886 while hurling a no-hitter in 1882; one of two pitchers to hit three home runs in a single game (along Jim Tobin) and the only pitcher in Major League Baseball history to collect six hits in a nine-inning game.
December 7 – Tom Kearns, 79, second baseman/catcher who played between 1880 and 1884 for the Buffalo Bisons and Detroit Wolverines.
December 19 – Art Griggs, 54, first baseman/outfielder for the Browns, Naps, Tip-Tops and Tigers between the 1909 and 1918 seasons.
December 24 – Luke Lutenberg, 74, first baseman for the 1894 Louisville Colonels.
December 24 – Bill Yohe, 60, first baseman who played for the Washington Senators of the American League during the 1909 season.