Detroit Lions
2012
| Date | Transaction |
| 06/25/2012 | Sam Proctor - Cut from Lions |
| 06/25/2012 | Sean Jones - Signed / unrestricted free agent to Lions - One-year contract (through 2012) |
| 06/22/2012 | Dontrell Johnson - Acquired from waivers to Lions |
| 06/22/2012 | Alonzo Lawrence - Cut from Lions |
| 06/21/2012 | Troy Burrell - Cut from Lions |
| 06/21/2012 | R.J. Archer - Signed to Lions |
| 06/13/2012 | Mikel LeShoure - Suspended from Lions - 2 games (NFL Substance Abuse Policy) |
| 06/12/2012 | Jarett Dillard - Signed / unrestricted free agent to Lions |
| 06/12/2012 | Quinn Barham - Cut from Lions |
| 06/05/2012 | Jared Karstetter - Cut from Lions |
| 06/05/2012 | Maurice Stovall - Re-signed / unrestricted free agent for Lions - One-year contract (through 2012) |
| 05/29/2012 | Robert Malone - Signed to Chargers |
| 05/16/2012 | Joe Jon Finley - Signed to Panthers |
| 05/15/2012 | Wallace Miles - Signed to Lions - One-year contract (though 2012) |
| 05/15/2012 | Sam Proctor - Signed to Lions |
| 05/15/2012 | Jerome Harrison - |
| 05/11/2012 | Dwight Bentley - Signed / draft choice to Lions - Four-year contract (through 2015) |
| 05/10/2012 | Stephfon Green - Signed to Lions |
| 05/10/2012 | Ronnie Sneed - Signed to Lions |
| 05/10/2012 | Carmen Messina - Signed to Lions |
| 05/10/2012 | J.C. Oram - Signed to Lions |
| 05/10/2012 | Kellen Moore - Signed to Lions |
| 05/10/2012 | Michael Cosgrove - Signed to Lions |
| 05/10/2012 | Jared Karstetter - Signed to Lions |
| 05/10/2012 | Derek Dimke - Signed to Lions |
| 05/10/2012 | Austin Wells - Signed to Lions |
| 05/10/2012 | Alex Gottlieb - Signed to Lions |
| 05/10/2012 | Troy Burrell - Signed to Lions |
| 05/10/2012 | Quinn Barham - Signed to Lions |
| 05/10/2012 | Tahir Whitehead - Signed / draft choice to Lions - Four-year contract (through 2015) |
| 05/10/2012 | Ryan Broyles - Signed / draft choice to Lions - Four-year contract (through 2015) |
| 05/10/2012 | Jonte Green - Signed / draft choice to Lions - Four-year contract (through 2015) |
| 05/10/2012 | Ronnell Lewis - Signed / draft choice to Lions - Four-year contract (through 2015) |
| 05/10/2012 | Travis Lewis - Signed / draft choice to Lions - Four-year contract (through 2015) |
| 05/10/2012 | Chris Greenwood - Signed / draft choice to Lions - Four-year contract (through 2015) |
| 05/10/2012 | Patrick Edwards - Signed to Lions |
| 05/10/2012 | Alonzo Lawrence - Signed to Lions |
| 05/10/2012 | Edmon McClam - Signed to Lions |
| 05/10/2012 | Rodney Austin - Signed to Lions |
| 05/10/2012 | Pat Boyle - Signed to Lions |
| 05/07/2012 | Hilee Taylor - Signed to Buccaneers |
| 05/01/2012 | Lance Long - Signed to Lions |
| 04/19/2012 | Sammie Hill - Re-signed / restricted free agent to Lions - One-year contract (through 2012) |
| 04/16/2012 | DeAndre Levy - Re-signed / restricted free agent to Lions - One-year contract (through 2012) |
| 04/16/2012 | Corey Hilliard - Re-signed / restricted free agent to Lions - One-year contract (through 2012) |
| 04/05/2012 | Bobby Carpenter - Signed / unrestricted free agent to Patriots |
| 03/27/2012 | Kevin Smith - Re-signed / unrestricted free agent for Lions - One-year contract (through 2012) |
| 03/22/2012 | Everette Brown - Signed to Lions - One-year contract (through 2012) |
| 03/22/2012 | Will Heller - Signed to Lions - One-year contract (through 2012) |
| 03/22/2012 | Ashlee Palmer - Re-signed / unrestricted free agent for Lions - One-year contract (through 2012) |
| 03/21/2012 | Don Muhlbach - Re-signed / unrestricted free agent for Lions |
| 03/20/2012 | Jacob Lacey - Signed / unrestricted free agent to Lions |
| 03/20/2012 | Stephen Tulloch - Re-signed / unrestricted free agent for Lions - Five-year contract (through 2016) |
| 03/20/2012 | Andre Fluellen - Re-signed / unrestricted free agent for Lions |
| 03/19/2012 | Ben Graham - Re-signed / unrestricted free agent for Lions - One-year contract (through 2012) |
| 03/17/2012 | Jeff Backus - Re-signed / unrestricted free agent for Lions - Two-year contract (through 2013) |
| 03/17/2012 | Shaun Hill - Re-signed / unrestricted free agent for Lions - Two-year contract (through 2013) |
| 03/16/2012 | Drew Stanton - Signed / unrestricted free agent to Jets - One-year contract (through 2012) |
| 03/15/2012 | Erik Coleman - Re-signed / unrestricted free agent for Lions - One-year contract (through 2012) |
| 03/15/2012 | James Bryant - Signed to Lions |
| 03/14/2012 | Eric Wright - Signed / unrestricted free agent to Buccaneers - Five-year contract (through 2016) |
| 03/14/2012 | Calvin Johnson - Re-signed to Lions - Seven-year extension (through 2019) |
| 03/13/2012 | Kevin Smith - Declared free agent |
| 03/13/2012 | Brandon McDonald - Declared free agent |
| 03/13/2012 | Don Muhlbach - Declared free agent |
| 03/13/2012 | Ashlee Palmer - Declared free agent |
| 03/13/2012 | Rashied Davis - Declared free agent |
| 03/13/2012 | Erik Coleman - Declared free agent |
| 03/13/2012 | Maurice Stovall - Declared free agent |
| 03/13/2012 | Bobby Carpenter - Declared free agent |
| 03/13/2012 | Shaun Hill - Declared free agent |
| 03/13/2012 | Jeff Backus - Declared free agent |
| 03/13/2012 | Ben Graham - Declared free agent |
| 03/13/2012 | Eric Wright - Declared free agent |
| 03/13/2012 | DeAndre Levy - |
| 03/13/2012 | Drew Stanton - Declared free agent |
| 03/13/2012 | Chris Harris - Declared free agent |
| 03/13/2012 | Maurice Morris - Declared free agent |
| 03/13/2012 | Leonard Davis - Declared free agent |
| 03/13/2012 | Stephen Tulloch - Declared free agent |
| 03/13/2012 | Isaiah Ekejiuba - Declared free agent |
| 03/13/2012 | Corey Hilliard - |
| 03/13/2012 | Sammie Hill - |
| 03/12/2012 | Will Heller - Cut from Lions |
| 03/06/2012 | Justin Medlock - Signed to Panthers |
| 03/05/2012 | Cliff Avril - |