Kansas City Chiefs
2012
| Date | Transaction |
| 06/05/2012 | Alex Tanney - Signed to Chiefs |
| 06/04/2012 | Abram Elam - Signed / unrestricted free agent to Chiefs |
| 06/04/2012 | Wallace Gilberry - Signed / unrestricted free agent to Buccaneers - One-year contract |
| 05/22/2012 | Aaron Weaver - Signed to Chiefs |
| 05/17/2012 | Donald Stephenson - Signed / draft choice to Chiefs - Four-year contract (through 2015) |
| 05/16/2012 | Rich Ranglin - Signed to Chiefs |
| 05/16/2012 | Martin Rucker - Signed / unrestricted free agent to Chiefs |
| 05/16/2012 | Dominique Ellis - Signed to Chiefs |
| 05/16/2012 | Jeff Allen - Signed / draft choice to Chiefs - Four-year contract (through 2015) |
| 05/16/2012 | De'Quan Menzie - Signed / draft choice to Chiefs - Four-year contract (through 2015) |
| 05/16/2012 | Leon Williams - Signed / unrestricted free agent to Chiefs |
| 05/15/2012 | Barry Richardson - Signed / unrestricted free agent to Rams |
| 05/14/2012 | Garrett Brown - Signed to Chargers - One-year contract (through 2012) |
| 05/14/2012 | Eric Bakhtiari - Signed to 49ers - Two-year contract (through 2013) |
| 05/11/2012 | Junior Hemingway - Signed / draft choice to Chiefs - Four-year contract (through 2015) |
| 05/11/2012 | Jerome Long - Signed / draft choice to Chiefs - Four-year contract (through 2015) |
| 05/11/2012 | Devon Wylie - Signed / draft choice to Chiefs - Four-year contract (through 2015) |
| 05/11/2012 | Cyrus Gray - Signed / draft choice to Chiefs - Four-year contract (through 2015) |
| 05/08/2012 | Ropati Pitoitua - Signed to Chiefs |
| 04/30/2012 | Justin Cheadle - Signed to Chiefs |
| 04/30/2012 | Jean Fanor - Signed to Chiefs |
| 04/30/2012 | Ethan Johnson - Signed to Chiefs |
| 04/30/2012 | Tysyn Hartman - Signed to Chiefs |
| 04/30/2012 | Tim Biere - Signed to Chiefs |
| 04/30/2012 | Matt Szymanski - Signed to Chiefs |
| 04/30/2012 | Cam Holland - Signed to Chiefs |
| 04/30/2012 | Neiko Thorpe - Signed to Chiefs |
| 04/30/2012 | Nate Eachus - Signed to Chiefs |
| 04/30/2012 | Dexter Heyman - Signed to Chiefs |
| 04/30/2012 | Taylor Gentry - Signed to Chiefs |
| 04/30/2012 | Terrance Parks - Signed to Chiefs |
| 04/30/2012 | Brandon Kinnie - Signed to Chiefs |
| 04/30/2012 | Chandler Fenner - Signed to Chiefs |
| 04/30/2012 | Josh Bellamy - Signed to Chiefs |
| 04/17/2012 | Mikail Baker - Signed to Chiefs |
| 04/10/2012 | Leonard Pope - Signed / unrestricted free agent to Steelers - One-year contract (through 2012) |
| 04/04/2012 | Travis Daniels - Re-signed / unrestricted free agent for Chiefs |
| 03/23/2012 | Chris Manno - Signed to Panthers |
| 03/22/2012 | Jovan Belcher - Re-signed / restricted free agent to Chiefs - One-year contract (through 2012) |
| 03/19/2012 | Brady Quinn - Signed / unrestricted free agent to Chiefs |
| 03/19/2012 | Eric Winston - Signed to Chiefs - Four-year contract (through 2015) |
| 03/15/2012 | Kevin Boss - Signed / unrestricted free agent to Chiefs - Three-year contract (through 2014) |
| 03/14/2012 | Kyle Orton - Signed / unrestricted free agent to Cowboys - Three-year contract (through 2014) |
| 03/14/2012 | Peyton Hillis - Signed / unrestricted free agent to Chiefs - One-year contract (through 2012) |
| 03/14/2012 | Brandon Carr - Signed / unrestricted free agent to Cowboys - Five-year contract (through 2016) |
| 03/14/2012 | Le'Ron McClain - Signed / unrestricted free agent to Chargers - Three-year contract (through 2014) |
| 03/13/2012 | Tyler Palko - Declared free agent |
| 03/13/2012 | Kyle Orton - Declared free agent |
| 03/13/2012 | Ryan O'Callaghan - Declared free agent |
| 03/13/2012 | Leonard Pope - Declared free agent |
| 03/13/2012 | Brandon Carr - Declared free agent |
| 03/13/2012 | Jackie Battle - Declared free agent |
| 03/13/2012 | Reshard Langford - Declared free agent |
| 03/13/2012 | Casey Wiegmann - Declared free agent |
| 03/13/2012 | Wallace Gilberry - Declared free agent |
| 03/13/2012 | Kelly Gregg - Declared free agent |
| 03/13/2012 | Le'Ron McClain - Declared free agent |
| 03/13/2012 | Thomas Jones - Declared free agent |
| 03/13/2012 | Barry Richardson - Declared free agent |
| 03/13/2012 | Jerheme Urban - Declared free agent |
| 03/13/2012 | Sabby Piscitelli - Declared free agent |
| 03/13/2012 | Jon McGraw - Declared free agent |
| 03/13/2012 | Anthony Becht - Declared free agent |
| 03/13/2012 | Jovan Belcher - |
| 03/12/2012 | Amon Gordon - Re-signed to Chiefs - Two-year extension (through 2013) |
| 03/08/2012 | Demorrio Williams - Signed to Chargers - One-year contract |
| 03/06/2012 | Demorrio Williams - Cut from Chiefs |
| 03/05/2012 | Dwayne Bowe - |