Offseason

• December 2, 1963: Byron Browne
  Byron Browne
  Byron Ellis Browne is a former Major League Baseball outfielder. Browne was signed by the Pittsburgh Pirates as an amateur free agent in 1963. In his first Major League at-bat, Browne lined out in the second inning of Sandy Koufax's 1965 perfect game. Browne had the dubious distinction of...
  
   was drafted from the Pirates by the Chicago Cubs
  Chicago Cubs
  The Chicago Cubs are a professional baseball team located in Chicago, Illinois. They are members of the Central Division of Major League Baseball's National League. They are one of two Major League clubs based in Chicago . The Cubs are also one of the two remaining charter members of the National...
  
   in the 1963 first-year draft.
• January 14, 1964: Dock Ellis
  Dock Ellis
  Dock Phillip Ellis, Jr. was a professional baseball player who pitched for the Pittsburgh Pirates, among other teams in Major League Baseball. His best season was 1971, when he won 19 games for the World Series champion Pirates and was the starting pitcher for the National League in the All-Star...
  
   was signed as an amateur free agent by the Pirates.
• Prior to 1964 season: John Lamb
  John Lamb (baseball)
  John Andrew Lamb is a former Major League Baseball pitcher. He pitched in all or part of three seasons in the majors, between and , for the Pittsburgh Pirates.-Sources:...
  
   was signed as an amateur free agent by the Pirates.

Notable transactions

• June 13, 1964: Al Oliver
  Al Oliver
  Albert Oliver, Jr. is a former Major League Baseball player. Over the course of his 18-year career, he played for the Pittsburgh Pirates , Texas Rangers , Montreal Expos , San Francisco Giants , Philadelphia Phillies , Los Angeles Dodgers and Toronto Blue Jays...
  
   was signed as an amateur free agent by the Pirates.
• September 6, 1964: Wilbur Wood
  Wilbur Wood
  Wilbur Forrester Wood, Jr. is a former knuckleball pitcher in Major League Baseball for the Boston Red Sox, Pittsburgh Pirates, and most notably the Chicago White Sox, where he got 163 of his 164 wins...
  
   was purchased by the Pirates from 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"...
  
  .
• September 12, 1964: Smoky Burgess
  Smoky Burgess
  Forrest Harrill "Smoky" Burgess was an American professional baseball player, coach and scout. He played in Major League Baseball as a catcher from 1949 to 1967. Later in his career, he became known for his ability as a pinch hitter, setting the major league career record for career pinch-hits...
  
   was selected off waivers from the Pirates by 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...
  
  .

Roster

Starters by position

Other batters

Starting pitchers

Other pitchers

Relief pitchers

Farm system