Regular season

• September 20, 1956: Catcher Tom Gastall
  Tom Gastall
  Thomas Everett Gastall was an American baseball player who appeared in two seasons as a catcher for the Baltimore Orioles. A right-handed batter and thrower, he stood tall and weighed ....
  
   was killed in a plane crash.
• September 30, 1956: Joe Frazier
  Joe Frazier (baseball)
  Joseph Filmore Frazier was a former outfielder and manager in Major League Baseball. He was signed as an amateur free agent in 1941, but did not play in the major leagues until 1947. After 1947, he spent parts of three seasons in the 1950s, primarily with the St. Louis Cardinals...
  
   hit a home run in the last at bat of his career.

Notable transactions

• May 14, 1956: Billy Loes
  Billy Loes
  William Loes was an American right-handed pitcher who spent eleven seasons in Major League Baseball with the Brooklyn Dodgers , Baltimore Orioles and San Francisco Giants...
  
   was purchased by the Orioles from the Brooklyn Dodgers
  Los Angeles Dodgers
  The Los Angeles Dodgers are a professional baseball team based in Los Angeles, California. The Dodgers are members of Major League Baseball's National League West Division. Established in 1883, the team originated in Brooklyn, New York, where it was known by a number of nicknames before becoming...
  
   for $20,000.
• May 21, 1956: Dave Philley
  Dave Philley
  David Earl Philley is a former outfielder who played in Major League Baseball. A switch-hitter who threw right-handed, he debuted on September 6, and played his final game on August 6, . He was born in Paris, Texas....
  
   and Jim Wilson
  Jim Wilson (pitcher)
  James Alger Wilson , was a former professional baseball player who played pitcher in the Major Leagues from 1945-1958. He would play for the Boston Red Sox, St...
  
   were traded by the Orioles to the Chicago White Sox
  Chicago White Sox
  The Chicago White Sox are a Major League Baseball team located in Chicago, Illinois.The White Sox play in the American League's Central Division. Since , the White Sox have played in U.S. Cellular Field, which was originally called New Comiskey Park and nicknamed The Cell by local fans...
  
   for Mike Fornieles
  Mike Fornieles
  Jose Miguel "Mike" Fornieles was a professional baseball player. He was a right-handed pitcher over parts of twelve seasons with the Washington Senators/Minnesota Twins, Chicago White Sox, Baltimore Orioles and Boston Red Sox...
  
  , Connie Johnson
  Connie Johnson
  Connie Johnson, born Clifford Johnson Jr. , was an American professional baseball player, a pitcher in the Negro Leagues and Major League Baseball.-Kansas City Monarchs:...
  
  , George Kell
  George Kell
  George Clyde Kell was an American baseball third baseman who played for the Philadelphia Athletics , Detroit Tigers , Boston Red Sox , Chicago White Sox , and Baltimore Orioles in the American League, who went on to become a baseball broadcaster for 40 years.-Playing career:In college, Kell...
  
   and Bob Nieman
  Bob Nieman
  Robert Charles Nieman was a Major League Baseball outfielder and right-handed batter who played for the St. Louis Browns , Detroit Tigers , Chicago White Sox , Baltimore Orioles , St. Louis Cardinals , Cleveland Indians and San Francisco Giants...
  
  .
• July 13, 1956: Morrie Martin
  Morrie Martin
  Morris Webster Martin was a former left-handed Major League Baseball pitcher. He pitched in the major leagues from 1949–1959, appearing in 250 games for several different teams....
  
   was selected off waivers by the Orioles from the Chicago White Sox
  Chicago White Sox
  The Chicago White Sox are a Major League Baseball team located in Chicago, Illinois.The White Sox play in the American League's Central Division. Since , the White Sox have played in U.S. Cellular Field, which was originally called New Comiskey Park and nicknamed The Cell by local fans...
  
  .
• August 17, 1956: Hal Smith was traded by the Orioles to the Kansas City Athletics
  Oakland Athletics
  The Oakland Athletics are a Major League Baseball team based in Oakland, California. The Athletics are a member of the Western Division of Major League Baseball's American League. From to the present, the Athletics have played in the O.co Coliseum....
  
   for Joe Ginsberg
  Joe Ginsberg
  Myron Nathan "Joe" Ginsberg was a catcher for the Detroit Tigers , Cleveland Indians , Kansas City Athletics , Baltimore Orioles , Chicago White Sox , Boston Red Sox , and New York Mets...
  
  .

Roster

Starters by position

Other batters

Starting pitchers

Other pitchers

Relief pitchers

Farm system