Cubs Roster & Staff
Transactions
| Date | Transaction |
| 08/31/17 | Seattle Mariners traded CF Leonys Martin and cash to Chicago Cubs for Player To Be Named Later and cash. |
| 08/28/17 | Chicago Cubs sent SS Addison Russell on a rehab assignment to Iowa Cubs. |
| 08/28/17 | Chicago Cubs sent RHP Justin Grimm on a rehab assignment to Iowa Cubs. |
| 08/28/17 | Chicago Cubs signed free agent OF Carlos Morfa to a minor league contract. |
| 08/28/17 | Chicago Cubs signed free agent SS Reivaj Garcia to a minor league contract. |
| 08/26/17 | Chicago Cubs signed free agent 2B Christian Donahue to a minor league contract. |
| 08/23/17 | Milwaukee Brewers claimed RHP Aaron Brooks off waivers from Chicago Cubs. |
| 08/20/17 | Chicago Cubs optioned LHP Rob Zastryzny to Iowa Cubs. |
| 08/20/17 | Chicago Cubs activated C Rene Rivera. |
| 08/20/17 | Chicago Cubs activated RHP Koji Uehara from the 10-day disabled list. |
| 08/20/17 | Chicago Cubs optioned C Victor Caratini to Iowa Cubs. |
| 08/19/17 | Chicago Cubs claimed C Rene Rivera off waivers from New York Mets. |
| 08/19/17 | Chicago Cubs designated RHP Aaron Brooks for assignment. |
| 08/18/17 | Chicago Cubs recalled RHP Felix Pena from Iowa Cubs. |
| 08/18/17 | Chicago Cubs signed free agent LHP Chris Nunn to a minor league contract. |
| 08/18/17 | Chicago Cubs placed LHP Jon Lester on the 10-day disabled list. Left lat tightness. |
| 08/18/17 | Chicago Cubs placed RHP Justin Grimm on the 10-day disabled list. Right index finger infection. |
| 08/18/17 | Chicago Cubs recalled Rob Zastryzny from Iowa Cubs. |
| 08/15/17 | Chicago Cubs signed free agent RHP Scott Carroll to a minor league contract. |
| 08/11/17 | Chicago Cubs recalled Victor Caratini from Iowa Cubs. |
| 08/11/17 | Chicago Cubs placed C Willson Contreras on the 10-day disabled list retroactive to August 10, 2017. Right hamstring strain. |
| 08/09/17 | Chicago Cubs recalled RHP Justin Grimm from Iowa Cubs. |
| 08/09/17 | Chicago Cubs placed RHP Koji Uehara on the 10-day disabled list. Right neck strain. |
| 08/07/17 | Chicago Cubs signed free agent OF Kevin Miranda to a minor league contract. |
| 08/07/17 | Chicago Cubs signed free agent C Miguel Fabrizio to a minor league contract. |
| 08/06/17 | Chicago Cubs signed free agent 2B Mike Freeman to a minor league contract. |
| 08/06/17 | Chicago Cubs recalled 3B Tommy La Stella from Iowa Cubs. |
| 08/06/17 | Chicago Cubs optioned LHP Rob Zastryzny to Iowa Cubs. |
| 08/05/17 | Chicago Cubs signed free agent SS Fabian Pertuz to a minor league contract. |
| 08/04/17 | Chicago Cubs placed SS Addison Russell on the 10-day disabled list retroactive to August 2, 2017. Right foot strain. |
| 08/04/17 | Chicago Cubs recalled Rob Zastryzny from Iowa Cubs. |
| 08/04/17 | Los Angeles Dodgers claimed RHP Dylan Floro off waivers from Chicago Cubs. |
| 08/01/17 | Chicago Cubs activated C Alex Avila. |
| 08/01/17 | Chicago Cubs activated LHP Justin Wilson. |
| 08/01/17 | Chicago Cubs optioned C Victor Caratini to Iowa Cubs. |