Offseason

• November 17, 1969: Oscar Gamble
  Oscar Gamble
  Oscar Charles Gamble is a former outfielder and designated hitter in Major League Baseball. He played for 17 seasons, from 1969 to 1985, on seven different teams: the Chicago White Sox and New York Yankees on two separate occasions, as well as the Chicago Cubs, Philadelphia Phillies, Cleveland...
  
   and Dick Selma
  Dick Selma
  Richard Jay Selma was a professional baseball player who played pitcher in the Major Leagues from 1965-1974...
  
   were traded by the Cubs to the Philadelphia Phillies
  Philadelphia Phillies
  The Philadelphia Phillies are a Major League Baseball team. They are the oldest continuous, one-name, one-city franchise in all of professional American sports, dating to 1883. The Phillies are a member of the Eastern Division of Major League Baseball's National League...
  
   for Johnny Callison
  Johnny Callison
  John Wesley Callison was an American right fielder in Major League Baseball, best known for his years with the Philadelphia Phillies from 1960 to 1969...
  
   and a player to be named later. The Phillies completed the deal by sending Larry Colton
  Larry Colton
  Lawrence Robert Colton was a pitcher in Major League Baseball. He played for the Philadelphia Phillies in 1968.-External links:...
  
   to the Cubs in January, 1970.

Notable transactions

• April 22, 1970: Jim Qualls
  Jim Qualls
  James Robert Qualls is a former Major League Baseball outfielder and pinch-hitting specialist for the Chicago Cubs in 1969, the Montreal Expos in 1970 and the Chicago White Sox in 1972...
  
   was traded by the Cubs to the Montreal Expos
  Montreal Expos
  The Montreal Expos were a Major League Baseball team located in Montreal, Quebec from 1969 through 2004, holding the first MLB franchise awarded outside the United States. After the 2004 season, MLB moved the Expos to Washington, D.C. and renamed them the Nationals.Named after the Expo 67 World's...
  
   for Garry Jestadt
  Garry Jestadt
  Garry Arthur Jestadt , is a retired American Major League Baseball player who played infielder for the Chicago Cubs, San Diego Padres, and Montreal Expos in and –....
  
  .
• April 23, 1970: Steve Barber
  Steve Barber
  Stephen David Barber was an American Major League Baseball left-handed pitcher. He pitched from 1960-1974 for seven different teams, but is noted primarily for his time with the Baltimore Orioles...
  
   was signed as a free agent by the Cubs.
• May 29, 1970: Ted Abernathy
  Ted Abernathy
  Ted Wade Abernathy was a Major League Baseball relief pitcher. He batted and threw right-handed.A native of Stanley, North Carolina, Abernathy changed his pitching motion after shoulder surgery left his career in doubt, switching from a three-quarter delivery and becoming an effective sidearmer...
  
   was traded by the Cubs to the St. Louis Cardinals
  St. Louis Cardinals
  The St. Louis Cardinals are a professional baseball team based in St. Louis, Missouri. They are members of the Central Division in the National League of Major League Baseball. The Cardinals have won eleven World Series championships, the most of any National League team, and second overall only to...
  
   for Phil Gagliano
  Phil Gagliano
  Philip Joseph Gagliano is a former Major League Baseball infielder from 1963-1974. His brother, Ralph Gagliano, also played professional baseball. He became a good utility player during his early career with the St. Louis Cardinals and Chicago Cubs...
  
  .
• June 30, 1970: Steve Barber was released by the Cubs.
• July 29, 1970: Joe Pepitone
  Joe Pepitone
  Joseph "Joe" Anthony Pepitone is a former Major League Baseball first baseman and outfielder who played the bulk of his career for the New York Yankees. He also played several seasons with the Chicago Cubs and had short stints with the Houston Astros and Atlanta Braves...
  
   was purchased by the Cubs from the Houston Astros
  Houston Astros
  The Houston Astros are a Major League Baseball team located in Houston, Texas. They are a member of the National League Central division. The Astros are expected to join the American League West division in 2013. Since , they have played their home games at Minute Maid Park, known as Enron Field...
  
  .
• September 21, 1970: Hoyt Wilhelm
  Hoyt Wilhelm
  James Hoyt Wilhelm was an American Major League Baseball pitcher. He was elected to the Baseball Hall of Fame in 1985....
  
   was selected off waivers by the Cubs from the Atlanta Braves
  Atlanta Braves
  The Atlanta Braves are a professional baseball club based in Atlanta, Georgia. The Braves are a member of the Eastern Division of Major League Baseball's National League. The Braves have played in Turner Field since 1997....
  
  .

Draft picks

• June 4, 1970: 1970 Major League Baseball Draft
  1970 Major League Baseball Draft
  -First round selections:The following are the first round picks in the 1970 Major League Baseball draft.* Did not sign- Background :The regular and secondary phases of the January draft proved more fruitful to major league clubs than the June draft...
  
  
  • Rick Reuschel
    Rick Reuschel
    Rickey Eugene Reuschel is a former professional baseball pitcher from the early 1970s into the early 1990s. His nickname was "Big Daddy" because of his portly physique...
    
     was drafted by the Cubs in the 3rd round.
  • Jeff Schneider
    Jeff Schneider
    Jeffrey Theodore "Jeff" Schneider is former Major League Baseball pitcher. Schneider played for the Baltimore Orioles in . He was on a rookie card with Hall of Famer Cal Ripken.-External links:*...
    
     was drafted by the Cubs in the 18th round, but did not sign.

Roster

Starters by position

Other batters

Starting pitchers

Other pitchers

Relief pitchers

Farm system