Orioles Roster & Staff
Transactions
| Date | Transaction |
| 01/31/12 | Baltimore Orioles signed free agent LHP Yoshihiro Doi to a minor league contract. |
| 01/30/12 | Baltimore Orioles invited non-roster C Brian Ward to spring training. |
| 01/30/12 | Baltimore Orioles signed free agent RHP Pat Neshek to a minor league contract and invited him to spring training. |
| 01/30/12 | Baltimore Orioles signed free agent C Ronny Paulino to a minor league contract and invited him to spring training. |
| 01/30/12 | Baltimore Orioles invited non-roster C John Hester to spring training. |
| 01/30/12 | Baltimore Orioles signed free agent RHP Armando Galarraga to a minor league contract and invited him to spring training. |
| 01/30/12 | Baltimore Orioles invited non-roster RHP Steve Johnson to spring training. |
| 01/25/12 | Baltimore Orioles signed free agent C Scott Thomas to a minor league contract. |
| 01/24/12 | Baltimore Orioles signed free agent 3B Wilson Betemit. |
| 01/24/12 | Baltimore Orioles designated RHP Rick van den Hurk for assignment. |
| 01/20/12 | Baltimore Orioles signed free agent RF Cory Aldridge to a minor league contract. |
| 01/20/12 | Baltimore Orioles signed free agent RHP Robert Hinton to a minor league contract. |
| 01/20/12 | Baltimore Orioles signed free agent LHP Chris George to a minor league contract. |
| 01/20/12 | Baltimore Orioles signed free agent 1B Pita Rona to a minor league contract. |
| 01/20/12 | Baltimore Orioles signed free agent RHP Oscar Villarreal to a minor league contract and invited him to spring training. |
| 01/20/12 | Baltimore Orioles signed free agent LHP Dennys Reyes to a minor league contract and invited him to spring training. |
| 01/19/12 | Baltimore Orioles released LF Kyle Hudson. |
| 01/18/12 | Baltimore Orioles signed free agent LHP Seongmin Kim to a minor league contract. |
| 01/13/12 | Baltimore Orioles signed free agent 2B Peter Fatse to a minor league contract. |
| 01/13/12 | Baltimore Orioles signed free agent Will Startup. |
| 01/12/12 | Baltimore Orioles signed free agent C Zach Booker to a minor league contract. |
| 01/12/12 | Baltimore Orioles signed free agent OF Edgardo Baez to a minor league contract. |
| 01/11/12 | Baltimore Orioles signed free agent Winston Abreu. |
| 01/11/12 | Baltimore Orioles signed free agent 3B Thomas Di Benedetto to a minor league contract. |
| 01/11/12 | Baltimore Orioles signed free agent LF Travis Adair to a minor league contract. |
| 01/10/12 | Baltimore Orioles signed free agent LHP Wei-Yin Chen. |
| 01/10/12 | Baltimore Orioles designated LF Kyle Hudson for assignment. |
| 01/09/12 | Baltimore Orioles signed free agent RHP Kyler Newby to a minor league contract. |
| 01/09/12 | Baltimore Orioles signed free agent RHP Francis Beltran to a minor league contract. |
| 01/09/12 | Baltimore Orioles signed free agent C Allan de San Miguel to a minor league contract. |
| 01/05/12 | Baltimore Orioles signed free agent RHP Ross Wolf to a minor league contract. |
| 01/04/12 | Baltimore Orioles signed free agent RHP Willie Eyre to a minor league contract and invited him to spring training. |
| 01/03/12 | Oakland Athletics traded CF Jai Miller to Baltimore Orioles. |
| 01/03/12 | Baltimore Orioles traded 1B Brandon Snyder to Texas Rangers. |