Cubs Roster & Staff
Transactions
| Date | Transaction |
| 07/31/18 | Washington Nationals traded RHP Brandon Kintzler to Chicago Cubs for RHP Jhon Romero. |
| 07/31/18 | Chicago Cubs transferred RHP Justin Hancock from the 10-day disabled list to the 60-day disabled list. Right shoulder inflammation. |
| 07/31/18 | Washington Nationals traded RHP Brandon Kintzler to Chicago Cubs for RHP Jhon Romero. |
| 07/29/18 | Chicago Cubs activated LHP Cole Hamels. |
| 07/29/18 | Chicago Cubs optioned RHP Cory Mazzoni to Iowa Cubs. |
| 07/28/18 | Chicago Cubs optioned RHP Alec Mills to Iowa Cubs. |
| 07/28/18 | Chicago Cubs recalled Cory Mazzoni from Iowa Cubs. |
| 07/27/18 | Chicago Cubs recalled Alec Mills from Iowa Cubs. |
| 07/27/18 | Texas Rangers traded LHP Cole Hamels and cash to Chicago Cubs for Eddie Butler, RHP Rollie Lacy and Player To Be Named Later. |
| 07/27/18 | Texas Rangers traded LHP Cole Hamels and cash to Chicago Cubs for Eddie Butler, RHP Rollie Lacy and Player To Be Named Later. |
| 07/27/18 | Texas Rangers traded LHP Cole Hamels and cash to Chicago Cubs for Eddie Butler, RHP Rollie Lacy and Player To Be Named Later. |
| 07/26/18 | Chicago Cubs recalled 3B David Bote from Iowa Cubs. |
| 07/26/18 | Chicago Cubs placed 3B Kris Bryant on the 10-day disabled list retroactive to July 24, 2018. Left shoulder inflammation. |
| 07/24/18 | Chicago Cubs activated RHP Eddie Butler from the 60-day disabled list. |
| 07/24/18 | Chicago Cubs optioned RHP Luke Farrell to Iowa Cubs. |
| 07/22/18 | Chicago Cubs optioned RHP Dillon Maples to Iowa Cubs. |
| 07/21/18 | Chicago Cubs recalled Dillon Maples from Iowa Cubs. |
| 07/21/18 | Chicago Cubs optioned RHP James Norwood to Iowa Cubs. |
| 07/21/18 | Chicago Cubs activated RHP Jesse Chavez. |
| 07/21/18 | Chicago Cubs recalled Luke Farrell from Iowa Cubs. |
| 07/21/18 | Chicago Cubs placed RHP Anthony Bass on the 10-day disabled list. Right mid-thoracic strain, |
| 07/19/18 | Chicago Cubs recalled RHP James Norwood from Iowa Cubs. |
| 07/19/18 | Albert Almora Jr. roster status changed by Chicago Cubs. |
| 07/19/18 | Chicago Cubs placed RHP Brandon Morrow on the 10-day disabled list retroactive to July 18, 2018. Right biceps inflammation. |
| 07/19/18 | Texas Rangers traded RHP Jesse Chavez to Chicago Cubs for LHP Tyler Thomas. |
| 07/19/18 | Texas Rangers traded RHP Jesse Chavez to Chicago Cubs for LHP Tyler Thomas. |
| 07/18/18 | Chicago Cubs optioned James Norwood to Iowa Cubs. |
| 07/18/18 | Chicago Cubs activated RHP Anthony Bass from the 10-day disabled list. |
| 07/17/18 | Chicago Cubs sent RHP Anthony Bass on a rehab assignment to Iowa Cubs. |
| 07/17/18 | Chicago Cubs signed free agent RHP Gabriel Jaramillo to a minor league contract. |
| 07/16/18 | Chicago Cubs activated RHP Carl Edwards Jr. from the paternity list. |
| 07/16/18 | Chicago Cubs optioned LHP Rob Zastryzny to Iowa Cubs. |
| 07/16/18 | Chicago Cubs optioned 2B David Bote to Iowa Cubs. |
| 07/15/18 | CF Albert Almora Jr. roster status changed by Chicago Cubs. |
| 07/15/18 | Chicago Cubs recalled David Bote from Iowa Cubs. |
| 07/14/18 | Chicago Cubs recalled Rob Zastryzny from Iowa Cubs. |
| 07/14/18 | Chicago Cubs placed RHP Carl Edwards Jr. on the paternity list. |
| 07/13/18 | Chicago Cubs activated LHP Brian Duensing from the 10-day disabled list. |
| 07/13/18 | Chicago Cubs optioned RHP Luke Farrell to Iowa Cubs. |
| 07/12/18 | Chicago Cubs optioned RHP Luke Farrell to Iowa Cubs. |
| 07/11/18 | Chicago Cubs signed C Caleb Knight. |
| 07/11/18 | Chicago Cubs optioned 2B David Bote to Iowa Cubs. |
| 07/11/18 | Chicago Cubs activated 3B Kris Bryant from the 10-day disabled list. |
| 07/10/18 | Chicago Cubs sent LHP Brian Duensing on a rehab assignment to Tennessee Smokies. |
| 07/09/18 | Chicago Cubs sent 3B Kris Bryant on a rehab assignment to Tennessee Smokies. |
| 07/08/18 | Chicago Cubs placed RHP Anthony Bass on the 10-day disabled list retroactive to July 5, 2018. Illness. |
| 07/08/18 | Chicago Cubs selected the contract of James Norwood from Iowa Cubs. |
| 07/07/18 | Chicago Cubs signed free agent SS Ronny Simon to a minor league contract. |
| 07/06/18 | Chicago Cubs sent C Chris Gimenez outright to Iowa Cubs. |
| 07/06/18 | Chicago Cubs signed RHP Niels Stone. |
| 07/06/18 | Chicago Cubs signed 2B Andy Weber. |
| 07/06/18 | Chicago Cubs placed RHP Oscar De La Cruz on the restricted list. |
| 07/06/18 | Chicago Cubs optioned RHP Dillon Maples to Iowa Cubs. |
| 07/06/18 | Chicago Cubs activated RHP Carl Edwards Jr. from the 10-day disabled list. |
| 07/06/18 | Chicago Cubs signed LHP Josh Sawyer. |
| 07/06/18 | Chicago Cubs signed OF Edmond Americaan. |
| 07/06/18 | Chicago Cubs optioned LHP Rob Zastryzny to Iowa Cubs. |
| 07/06/18 | Chicago Cubs signed RHP Jake Reindl. |
| 07/05/18 | Chicago Cubs sent LHP Rob Zastryzny on a rehab assignment to Iowa Cubs. |
| 07/05/18 | Chicago Cubs signed free agent LHP James Buckelew to a minor league contract. |
| 07/05/18 | Chicago Cubs signed free agent RHP Casey Coleman to a minor league contract. |
| 07/05/18 | Chicago Cubs optioned RHP Dillon Maples to Iowa Cubs. |
| 07/04/18 | Chicago Cubs designated Chris Gimenez for assignment. |
| 07/04/18 | Chicago Cubs recalled C Victor Caratini from Iowa Cubs. |
| 07/03/18 | Chicago Cubs signed free agent LHP Ryan Lawlor to a minor league contract. |
| 07/02/18 | Chicago Cubs signed free agent RHP Richard Gallardo to a minor league contract. |
| 07/02/18 | Chicago Cubs signed free agent LHP Joel Machado to a minor league contract. |
| 07/02/18 | Chicago Cubs signed free agent OF Yohendrick Pinango to a minor league contract. |
| 07/01/18 | Chicago Cubs placed LHP Brian Duensing on the 10-day disabled list. Left shoulder fatigue. |
| 07/01/18 | Chicago Cubs recalled Dillon Maples from Iowa Cubs. |