Offseason

• October 2, 1958: Dick Williams
  Dick Williams
  Richard Hirschfeld "Dick" Williams was an American left fielder, third baseman, manager, coach and front office consultant in Major League Baseball. Known especially as a hard-driving, sharp-tongued manager from 1967–69 and 1971–88, he led teams to three American League pennants, one National...
  
   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 Chico Carrasquel
  Chico Carrasquel
  Alfonso Carrasquel Colón, better known as Chico Carrasquel was a Venezuelan professional baseball player. He played in Major League Baseball as a shortstop for the Chicago White Sox , Cleveland Indians , Kansas City Athletics and the Baltimore Orioles...
  
  .
• Prior to 1959 season (exact date unknown)
  • John Anderson
    John Anderson (pitcher)
    John Charles Anderson is a former professional baseball pitcher. He played parts of three seasons in Major League Baseball, between 1958 and 1962, for the Philadelphia Phillies, Baltimore Orioles, St. Louis Cardinals, and Houston Colt .45s.- References :...
    
     was obtained by the Orioles from the Miami Marlins
    Miami Marlins (IL)
    The Miami Marlins was the name of a Class AAA American minor league baseball franchise based in Miami, Florida, that played in the International League from 1956 through 1960.The Marlins were a transplanted version of the original Syracuse Chiefs...
    
     after expiration of minor league working agreement.
  • Bob Saverine
    Bob Saverine
    Robert Paul Saverine is a former Major League Baseball infielder/outfielder. He was signed by the Baltimore Orioles as an amateur free agent before the 1959 season and played for the Orioles and the Washington Senators...
    
     was signed as an amateur free agent by the Orioles.

Regular season

• June 10, 1959: Rocky Colavito
  Rocky Colavito
  Rocco Domenico "Rocky" Colavito, Jr. is a former right fielder in Major League Baseball best known for his years with the Cleveland Indians. He wore a #6, #7 or #21 jersey during his MLB career...
  
   of the Cleveland Indians
  Cleveland Indians
  The Cleveland Indians are a professional baseball team based in Cleveland, Ohio. They are in the Central Division of Major League Baseball's American League. Since , they have played in Progressive Field. The team's spring training facility is in Goodyear, Arizona...
  
   hit four home runs in one game against the Orioles.

Opening Day starters

• Bob Boyd
• Billy Gardner
  Billy Gardner
  William Frederick Gardner is an American former Major League Baseball player, coach and manager. Gardner was a scrappy light-hitting second baseman who batted and threw right-handed. Gardner played for the New York Giants, Baltimore Orioles, Washington Senators/Minnesota Twins, New York Yankees,...
  
  
• Ron Hansen
  Ron Hansen (baseball)
  Ronald Lavern Hansen is a former shortstop in Major League Baseball who played for the Baltimore Orioles , Chicago White Sox , Washington Senators , New York Yankees and Kansas City Royals...
  
  
• Al Pilarcik
  Al Pilarcik
  Alfred James Pilarcik was an American professional baseball player. An outfielder, he appeared in 668 Major League games between and for the Kansas City Athletics, Baltimore Orioles and Chicago White Sox...
  
  
• Arnie Portocarrero
  Arnie Portocarrero
  Arnold Mario Portocarrero , was a professional baseball player who played pitcher in the Major Leagues from -. He would play for the Philadelphia Athletics, Kansas City Athletics, and Baltimore Orioles.-External links:...
  
  
• Brooks Robinson
  Brooks Robinson
  Brooks Calbert Robinson, Jr. is a former American professional baseball player. He played his entire 23-year major league career for the Baltimore Orioles . Nicknamed "The Human Vacuum Cleaner", he is generally acclaimed as the greatest defensive third-basemen in major league history...
  
  
• Willie Tasby
  Willie Tasby
  Willie Tasby Jr. was a Major League Baseball player for six seasons, all in the American League. Tasby came up with the Baltimore Orioles and spent time with the Boston Red Sox, Washington Senators, and Cleveland Indians...
  
  
• Gus Triandos
  Gus Triandos
  Gus Triandos is a Greek-American former professional baseball player. He played in Major League Baseball mostly as a catcher but also played as a first baseman for the New York Yankees, Baltimore Orioles and the Detroit Tigers of the American League and the Philadelphia Phillies and Houston Astros...
  
  
• Gene Woodling
  Gene Woodling
  Eugene Richard Woodling was a Major League Baseball outfielder for the Cleveland Indians , Pittsburgh Pirates , New York Yankees , Baltimore Orioles , Washington Senators , and the New York Mets in their expansion year of 1962...
  
  

Notable transactions

• April 1, 1959: Vito Valentinetti
  Vito Valentinetti
  Vito John Valentinetti is an American former Major League Baseball pitcher who played for five seasons. A graduate of Iona College, he played for the Chicago White Sox in 1954, the Chicago Cubs from 1956 to 1957, the Cleveland Indians in 1957, the Detroit Tigers in 1958, and the Washington...
  
   was acquired by the Orioles from the Washington Senators
  Minnesota Twins
  The Minnesota Twins are a professional baseball team based in Minneapolis, Minnesota. They play in the Central Division of Major League Baseball's American League. The team is named after the Twin Cities area of Minneapolis and St. Paul. They played in Metropolitan Stadium from 1961 to 1981 and the...
  
   in exchange for Billy Loes. The trade was voided and the players returned to their original teams on April 8.
• May 21, 1959: Bobby Avila
  Bobby Avila
  Roberto Francisco Ávila González to Maria Gonzalez and Jorge Avila, was a Major League Baseball second baseman and right-handed batter who played for the Cleveland Indians , Baltimore Orioles , Boston Red Sox , Milwaukee Braves and Tigres del México...
  
   was acquired by the Boston Red Sox
  Boston Red Sox
  The Boston Red Sox are a professional baseball team based in Boston, Massachusetts, and a member of Major League Baseball’s American League Eastern Division. Founded in as one of the American League's eight charter franchises, the Red Sox's home ballpark has been Fenway Park since . The "Red Sox"...
  
   from the Orioles off waivers.
• May 26, 1959: Albie Pearson
  Albie Pearson
  Albert Gregory Pearson is a former center fielder in Major League Baseball who played with the Washington Senators , Baltimore Orioles and Los Angeles/California Angels . One of the smallest MLB players of his era, he stood tall, weighed , and batted and threw left-handed...
  
   was acquired by the Orioles from the Washington Senators in exchange for Lenny Green
  Lenny Green
  Leonard Charles Green is a former outfielder in Major League Baseball who played from through for the Baltimore Orioles , Washington Senators/Minnesota Twins , Los Angeles Angels , Boston Red Sox and Detroit Tigers . He batted and threw left-handed...
  
  .
• June 15, 1959: Billy Hoeft
  Billy Hoeft
  William Frederick Hoeft was a pitcher in Major League Baseball whose career spanned 15 seasons with the Detroit Tigers, Boston Red Sox, Baltimore Orioles, Milwaukee Braves, Chicago Cubs and San Francisco Giants. He was born in Oshkosh, Wisconsin.-Detroit Tigers :Hoeft was signed by the Detroit...
  
   was acquired by the Orioles from the Boston Red Sox in exchange for Jack Harshman
  Jack Harshman
  John Elvin Harshman , is a former professional baseball pitcher who played from 1945 through 1960. He played for the New York Giants, Chicago White Sox, Baltimore Orioles, Boston Red Sox, and Cleveland Indians....
  
  .
• June 23, 1959: Whitey Lockman
  Whitey Lockman
  Carroll Walter "Whitey" Lockman was a player, coach, manager and front office executive in American Major League Baseball.-Role in miraculous 1951 comeback:...
  
   was traded by the Orioles to the Cincinnati Redlegs
  Cincinnati Reds
  The Cincinnati Reds are a Major League Baseball team based in Cincinnati, Ohio. They are members of the National League Central Division. The club was established in 1882 as a charter member of the American Association and joined the National League in 1890....
  
   for Walt Dropo
  Walt Dropo
  Walter Dropo , nicknamed "Moose", was an American college basketball standout and a professional baseball first baseman...
  
  .
• September 6, 1959: Rip Coleman
  Rip Coleman
  Walter Gary "Rip" Coleman is a former left-handed Major League Baseball pitcher who played from 1955 to 1957 and 1959 to 1960 for the New York Yankees, Kansas City Athletics and Baltimore Orioles....
  
   was acquired by the Orioles off waivers from the Kansas City Athletics.

Roster

Starters by position

Other batters

Starting pitchers

Other pitchers

Relief pitchers

Farm system