The following are the baseball events of the year 1948 throughout the world.
Major league baseball final standings
American League final standings
National League final standings
Negro league baseball final standings
Negro American League final standings
- Birmingham won the first half, Kansas City won the second half.
- Birmingham beat Kansas City 3 games to 1 games in a play-off.
Negro National League final standings
- No standings were published.
- Baltimore won the first half, Washington won the second half.
- July 7 – The Cleveland Indians stun the baseball world by signing Satchel Paige, a veteran Negro League pitcher. At 42, Paige becomes the oldest player to debut in the majors. He would be inducted into the Hall of Fame in 1971.
- July 13 – At Sportsman's Park, home of the St. Louis Browns, the American League defeats the National League, 5-2, in the All-Star Game.
- July 18 – Chicago White Sox left fielder Pat Seerey hits four home runs in a game against the Philadelphia Athletics, to become the fifth Major League player to accomplish the feat. The White Sox win, 12-11, in 11 innings.
- July 24 – Four members of the Duluth Dukes of the Northern League are killed, while 14 are injured, seven critically, in a bus-truck crash near St. Paul, Minnesota. All told, five persons die including the team's manager, George Treadwell; three players, and the driver of the truck. The injured list include Mel McGaha, a future major league manager in the 1960s, and the infielder Elmer Schoendienst, younger brother of the St. Louis Cardinals second baseman Red Schoendienst. The tragedy recalls the 1946 bus crash involving the Spokane Indians baseball team which took the lives of nine players.
- August 12 – In the second game of a doubleheader, the Cleveland Indians rap out 29 hits in a 26-3 win over the St. Louis Browns. The Indians set a Major League record as 14 different players hit safely.
- September 9 – Rex Barney of the Brooklyn Dodgers pitches a 2–0 no-hitter over the New York Giants at the Polo Grounds.
- September 26 – At Braves Field, Boston Braves' Bob Elliott hits a three-run homer, as the Braves beat the New York Giants, 3-2, and clinch the Braves' first N.L. pennant since 1914.
- October 4 – The Cleveland Indians defeat the Boston Red Sox, 8–3, in an American League one-game playoff game after finishing the season tied for first place. The Indians win the pennant and advance to the World Series. The Red Sox defeat disappointed Boston fans who had been rooting the entire season for an All-Boston World Series between the AL Red Sox and the National League Braves. It was the second time an All-Boston World Series had been thwarted as in 1891, when the NL champion Boston Beaneaters refused to meet the American Association champion Boston Reds in a proposed 1891 World Series due to inter-league squabbling over player contracts.
- October 11 – The Cleveland Indians defeat the Boston Braves, 4–3, in Game 6 of the World Series to win their second World Championship title, four games to two. In Game 4, Larry Doby became the first black player to hit a home run in the World Series. The Braves were back in the Series after a 34 year absence. This was also both the first AL pennant and WS Championship for the Indians in 28 years. To date, the Indians have yet to win another World Series.
- October 12 – The New York Yankees hire Casey Stengel to be the manager beginning with the 1949 season.
- November 10 – The Chicago White Sox acquire young left handed pitcher Billy Pierce from the Detroit Tigers in exchange for All-Star catcher Aaron Robinson, in a move that will give them their pitching ace for the next decade. Detroit even sweetens the deal with $10,000. Pierce will win 186 games for the White Sox over the next 13 years, but Robinson will last fewer than three seasons in Detroit.
- November 26 – National League president Ford Frick steps in and pays $350 for funeral services, including the cost of a coffin, for the unclaimed body of Hack Wilson. The former slugger, who had died probably of alcohol abuse a few days earlier in a Baltimore hospital, is identified only as a white male.
- November 30 – Cleveland Indians shortstop/manager Lou Boudreau is selected the American League MVP. Boudreau had almost been traded to the St. Louis Browns earlier in the year, but protests by Indians fans kept him in Cleveland. After the World Series victory, Indians owner Bill Veeck commented: Sometimes the best trades are the ones you never make.
- December 2 – Stan Musial of the St. Louis Cardinals is named National League Most Valuable Player. In one of the best season ever, Musial led the NL in batting average (.376), runs (135), RBI (131), hits (230), doubles (46), triples (18) and slugging pct. (.702). His 39 home runs were one short of Johnny Mize and Ralph Kiner league's leaders.
- January 4 – Biff Schlitzer, 63, who pitched from 1908 through 1914 for the Philadelphia Athletics, Boston Red Sox and Buffalo Blues.
- January 8 – Howdy Caton, 53, shortstop for the Pittsburgh Pirates over parts of four seasons from 1917–1920.
- January 9 – Art Jahn, 52, part-time outfielder who played for the Chicago Cubs, New York Giants and Philadelphia Phillies during two seasons spanning 1925 to 1928.
- January 14 – Art Benedict, 85, second baseman who appeared in three games with the Philadelphia Quakers in 1883.
- January 23 – Frank Doljack, 40, outfielder who played for the Detroit Tigers from 1930 through 1934 and the Cleveland Indians in 1943.
- January 30 – Herb Pennock, 53, Hall of Fame pitcher for the Philadelphia Athletics, Boston Red Sox and New York Yankees in a span of 22 seasons from 1912–1924, who during his career posted a lifetime record of 240–161 with a 3.60 ERA in 617 games, while collecting collecting a perfect 5–0 with a 1.95 ERA in five World Series trips with the Yankees, including their first World Series championship.
- January 31 – Clarence Lehr, 61, who played some outfield and infield utility positions with the Philadelphia Phillies in 1911.
- February 1 – Jim McCormick, 79, infielder who played three games for the National League St. Louis Browns in 1892.
- February 10 – Bill Clancy, 68, first baseman for the 1905 Pittsburgh Pirates.
- February 14 – Mordecai Brown, 71, Hall of Fame pitcher whose loss of two fingers in a childhood accident gave him remarkable movement on pitches, winning 20 games six straight years for the Chicago Cubs, while posting a career record of 239–130 with a 2.06 earned run average; the third best ERA in Major League Baseball history amongst pitchers inducted into the Hall of Fame, as well as the best in MLB history for any pitcher with more than 200 wins.
- February 16 – Percy Coleman, 71, pitcher who played from 1897 to 1898 for the St. Louis Browns and Cincinnati Reds.
- February 19 – Bob Groom, 63, pitcher for the Washington Senators, St. Louis Terriers, St. Louis Browns and Cleveland Indians during 10 seasons from 1909 to 1918, who also hurled a no-hitter in 1917 against the eventual World Champion Chicago White Sox.
- February 21 – Irv Ray, 84, shortstop who played with the Boston Beaneaters of the National League in 1888 and 1889, and the Baltimore Orioles of the American Association from 1889 to 1891.
- March 1 – Rebel Oakes, 64, center fielder who played from 1909 through 1913 with the Cincinnati Reds and St. Louis Cardinals, and later served as a player-manager for the Pittsburgh Rebels of the outlaw Federal League in the 1914 and 1915 seasons.
- March 10 – Stub Brown, 77, pitcher for the Baltimore Orioles from 1893 to 1894 and the Cincinnati Reds in 1897.
- March 17 – Ike Butler, 74, pitcher for the 1902 Baltimore Orioles.
- March 18 – Fritz Von Kolnitz, 54, third baseman who played for the Cincinnati Reds from 1914 to 1915 and the Chicago White Sox in 1916.
- March 23 – Dutch Meier, 68, outfielder and shortstop who played for the Pittsburgh Pirates in 1906.
- March 24 – Jimmy Bannon, 76, outfielder for the St. Louis Browns in 1893 and the Boston Beaneaters from 1894 to 1896.
- March 30 – Charlie Krause, 76, second baseman for the 1901 Cincinnati Reds.
- April 1 – Heinie Jantzen, 57, outfielder for the 1912 St. Louis Browns.
- April 3 – Candy Jim Taylor, 64, Negro League Baseball third baseman and manager.
- April 16 – Dick Kauffman, 59, first baseman who played for the St. Louis Browns in the 1914 and 1915 seasons.
- April 17 – Pat Deisel, catcher for the 1902 Brooklyn Superbas and the 1903 Cincinnati Reds.
- April 25 – Bertrum Hunter, 42, Negro league baseball player.
- April 27 – Ad Yale, 78, who appeared in four games with the Brooklyn Superbas in the 1905 season.
- July 1 – Pete Knisely, 60, outfielder who played for the Cincinnati Reds and Chicago Cubs over parts of four seasons from 1912 to 1915.
- July 3 – Charles Witherow, 96, pitcher who appeared in just one game for the Washington Nationals in 1875.
- July 5 – Ed Smith, 84, Canadian pitcher who played in 1884 for the Baltimore Monumentals of the Union Association.
- July 11 – Bert Hall, 58, for the 1911 Philadelphia Phillies.
- July 18 – Chick Hartley, 67, outfielder who played for the New York Giants in the 1902 season.
- July 19 – Charlie See, 51, outfielder who played from 1919 through 1921 for the Cincinnati Reds.
- July 26 – Homer Davidson, 63, catcher and right fielder who appeared in four games for the Cleveland Naps in 1914.
- July 27 – Joe Tinker, 68, Hall of Fame shortstop who along second baseman Johnny Evers and first baseman Frank Chance anchored a famed infield double play combination, which is memorialized in the legendary poem Baseball's Sad Lexicon, as the trio led the Chicago Cubs during the glory years of 1906–1910 to four National League pennants and two World Series titles.
- July 29 – Arnie Stone, 55, pitcher for the Pittsburgh Pirates in the 1923 and 1924 seasons.
- August 7 – Charlie Wacker, 64, pitcher who played with the Pittsburgh Pirates in the 1909 season.
- August 9 – Chick Bowen, 51, backup outfielder for the 1919 New York Giants.
- August 9 – Harry Lord, 66, third baseman who played from 1907 through 1910 for the Boston Americans and Red Sox, before joining the Chicago White Sox from 1910 to 1914 and the Buffalo Blues in 1915.
- August 13 – Nig Perrine, 63, backup infielder for the 1907 Washington Senators.
- August 14 – Phil Collins, 46, pitcher for the Chicago Cubs, Philadelphia Phillies and St. Louis Cardinals between 1923 and 1935.
- August 16 – Babe Ruth, 53, Hall of Fame right fielder and pitcher, who is considered the greatest star in baseball history, while holding records for most home runs in a season (60) and lifetime (714), as well as most career RBI (2,213); lifetime .342 hitter also posted a 94-46 record and 2.28 ERA as a pitcher while playing for seven champions; won 1923 MVP award, at a time when AL rules prohibited winning it more than once.
- August 19 – Fred Odwell, 75, outfielder for the Cincinnati Reds during four seasons from 1904 to 1907, who led the National league in home runs in 1905.
- August 20 – Walter Blair, 64, catcher for the New York Highlanders from 1907 through 1911, who later played and managed for the Buffalo Buffeds/Blues of the Federal League during their only two seasons in 1914 and 1915.
- August 26 – Rip Cannell, 68, outfielder who played from 1904 to 1905 for the Boston Beaneaters of the National League.
- August 29 – Charlie Graham, 70, catcher for the 1906 Boston Red Sox, before becoming manager and owner of the PCL San Francisco Seals.
- September 3 – Bert Husting, 60, two-star athlete in the 1890s University of Wisconsin teams, who later pitched in the majors for the Pittsburgh Pirates, Milwaukee Brewers, Boston Americans and Philadelphia Athletics from 1900 to 1902.
- September 8 – Bill Byers, 70, backup catcher for the 1904 St. Louis Cardinals.
- September 18 – Art Devlin, 68, third baseman who played from 1904 through 1911 with the New York Giants and the Boston Braves from 1912 to 1913, also a member of the 1905 World Series champion team.
- September 23 – Rich Durning, 55, pitcher for the Brooklyn Robins from 1917 to 1918.
- September 26 – Elmer Leifer, 55, who made 10 appearances as a pinch hitter with the Chicago White Sox in 1921.
- October 8 – Al Orth, 76, pitcher who won 204 games with Phillies, Senators and Yankees while often batting .300.
- October 24 – Jack Thoney, 68, well-traveled outfielder/infielder who played from 1902 through 1911 for the Cleveland Bronchos, Baltimore Orioles, Washington Senators, New York Highlanders and Boston Red Sox.
- October 31 – Dick Redding, 58, star pitcher of the Negro Leagues who set numerous strikeout records and pitched several no-hitters.
- November 1 – Fred Mollenkamp, 58, first baseman who played for the Philadelphia Phillies in the 1914 season.
- November 4 – Jake Powell, 40, outfielder for the Washington Senators, New York Yankees and Philadelphia Phillies in a span of 11 seasons from 1930 to 1945, who helped the Yankees win the World Series every year from 1936 to 1939, and hit a .455 average in the 1936 series.
- November 7 – Jake Smith, 61, pitcher who appeared in two games for the Philadelphia Phillies during the 1911 season.
- November 15 – Joe Wagner, 59, second baseman for the Cincinnati Reds in the 1915 season.
- November 18 – Joe Regan, 76, outfielder for the 1898 New York Giants.
- November 22 – Bob Emmerich, 57, center fielder for the Boston Braves in the 1923 season.
- November 23 – Hack Wilson, 48, Hall of Fame center fielder for four different clubs during 12 seasons from !923–1934, most prominently with the Chicago Cubs between 1926 and 1931, who finished his career with a lifetime .307 batting average, 244 home runs, 1,063 RBI and four home run titles, hitting 56 long balls in 1930, to set a National League record that stood for 68 years, while driving in 191 runs in the same season, which still the all-time major league record.
- November 30 – Frank Bowerman, 79, catcher and battery-mate for Christy Mathewson on the New York Giants, who also played for the Baltimore Orioles and Pittsburgh Pirates, and later managed the 1909 Boston Doves.