2003-12-30 | Jason Johnson | Signed as Free Agent by Tigers. | P-OF | 6-6 | 235 | R | R | 1973-10-27 | Santa Barbara,CA | 1992- 0- 0-PIT
| MLB | 1997-2008 | 1992-2013 |
2003-12-19 | Fernando Vina | Signed as Free Agent by Tigers. | 2B-SS | 5-9 | 170 | L | R | 1969-04-16 | Sacramento,CA | 1990- 9- 253-NYN
| MLB | 1993-2004 | 1991-2004 |
2003-12-19 | Rondell White | Signed as Free Agent by Tigers. | LF-OF | 6-0 | 210 | R | R | 1972-02-23 | Milledgeville,GA | 1990- 1- 24-MON
| MLB | 1993-2007 | 1990-2007 |
2003-12-18 | Mike DiFelice | Signed as Free Agent by Tigers. | C-1B | 6-2 | 205 | R | R | 1969-05-28 | Philadelphia,PA | 1991- 11- 285-SLN
| MLB | 1996-2008 | 1991-2008 |
2003-12-18 | Al Levine | Signed as Free Agent by Tigers. | P | 6-3 | 198 | R | R | 1968-05-22 | Park Ridge,IL | 1991- 11- 306-CHA
| MLB | 1996-2005 | 1991-2008 |
2003-12-17 | Edgar Huerta | Contract purchased by Padres from Mexico City Tigers | P | 5-11 | 140 | L | L | 1979-10-21 | Culiacan,MX |
| AAA | | 2000-2014 |
2003-12-15 | Lino Urdaneta | Selected by Tigers from Indians in Rule 5 major league draft | P | 6-1 | 168 | R | R | 1979-11-20 | Caracas,VZ | 1996- 0- 0-LAN
| MLB | 2004-2007 | 1999-2008 |
2003-12-15 | Chris Shelton | Selected by Tigers from Pirates in Rule 5 major league draft | 1B-C | 6-0 | 200 | R | R | 1980-06-26 | Salt Lake City,UT | 2001- 33- 984-PIT
| MLB | 2004-2009 | 2001-2010 |
2003-12-15 | Mike Bumatay | Selected by Tigers from Rockies in Rule 5 major league draft | P | 6-0 | 177 | L | L | 1979-10-09 | Fresno,CA | 1998- 21- 628-PIT
| AAA | | 1998-2007 |
2003-12-15 | Jordan Gerk | Selected by Cubs from Tigers in Rule 5 minor league draft | P | 6-1 | 180 | L | L | 1979-07-06 | Kelowna,BC | 2000- 41-1217-DET
| AAA | | 2000-2005 |
2003-12-11 | David Cortes | Signed as Free Agent by Tigers. | P | 5-11 | 195 | R | R | 1973-10-15 | Mexicali,MX | 1996- 0- 0-ATL
| MLB | 1999-2006 | 1996-2010 |
2003-12-09 | Jason Smith | Signed as Free Agent by Tigers. | SS-2B | 6-3 | 190 | L | R | 1977-07-24 | Meridian,MS | 1996- 43-1288-TBA
| MLB | 2001-2009 | 1997-2015 |
2003-12-08 | Cliff Bartosh | Claimed on waivers by Indians from Tigers. | P | 6-2 | 175 | L | L | 1979-09-05 | West,TX | 1998- 29- 862-SDN
| MLB | 2004-2005 | 1998-2005 |
2003-12-07 | Marcus Thames | Signed as Free Agent by Tigers. | OF-LF | 6-2 | 205 | R | R | 1977-03-06 | Louisville,MS | 1996- 30- 899-NYA
| MLB | 2002-2011 | 1997-2011 |
2003-11-27 | Rick Palma | Signed by Tigers | P | 6-1 | 160 | L | L | 1979-09-26 | Maracay,VZ |
| AAA | | 1997-2006 |
2003-11-26 | Andy Barkett | Signed as Free Agent by Tigers. | 1B-OF | 6-1 | 205 | L | L | 1974-09-05 | Miami,FL | 1995- 0- 0-NYA
| MLB | 2001-2001 | 1995-2005 |
2003-11-24 | Ariel Prieto | Signed as Free Agent by Tigers. | P | 6-2 | 247 | R | R | 1969-10-22 | Havana,CU | 1995- 1- 5-OAK
| MLB | 1995-2001 | 1995-2005 |
2003-11-20 | Brian Schmack | Signed as Free Agent by Tigers. | P | 6-2 | 195 | R | R | 1973-12-07 | Chicago,IL | 1996- 0- 0-CHA
| MLB | 2003-2003 | 1992-2004 |
2003-11-20 | Pat Ahearne | re-signed by Tigers | P | 6-3 | 195 | R | R | 1969-12-10 | San Francisco,CA | 1992- 7- 196-DET
| MLB | 1995-1995 | 1992-2013 |
2003-11-17 | Jeff Inglin | Signed by Tigers | OF-3B | 5-11 | 180 | R | R | 1975-10-08 | Petaluma,CA | 1996- 16- 467-CHA
| AAA | | 1996-2005 |
2003-11-15 | Guillermo Rodriguez | Signed by Tigers | C-1B | 5-11 | 195 | R | R | 1978-05-15 | Barquisimeto,VZ | 1995- 0- 0-SFN
| MLB | 2007-2009 | 1996-2012 |
2003-11-14 | Warren Morris | Signed as Free Agent by Tigers. | 2B-3B | 5-11 | 179 | L | R | 1974-01-11 | Alexandria,LA | 1996- 5- 143-TEX
| MLB | 1999-2003 | 1994-2005 |
2003-11-14 | Rayner Bautista | re-signed by Tigers | SS-2B | 5-11 | 155 | R | R | 1978-09-17 | Nizao Bani,DR |
| AAA | | 1997-2009 |
2003-11-07 | Danny Klassen | Signed as Free Agent by Tigers. | SS-3B | 6-0 | 175 | R | R | 1975-09-22 | Leamington,ON | 1993- 2- 65-MIL
| MLB | 1998-2003 | 1993-2008 |
2003-11-01 | Tim Christman | Signed as Free Agent by Tigers. | P | 6-0 | 195 | L | L | 1975-03-31 | Oneonta,NY | 1996- 11- 326-COL
| MLB | 2001-2001 | 1996-2005 |
2003-10-31 | Cliff Bartosh | Claimed on waivers by Tigers from Padres. | P | 6-2 | 175 | L | L | 1979-09-05 | West,TX | 1998- 29- 862-SDN
| MLB | 2004-2005 | 1998-2005 |
2003-10-28 | Miguel Linares | Signed as nondrafted free agent by Tigers | 3B-SS | 6-2 | 180 | R | R | 1983-12-16 | Santo Domingo,DR |
| A+ | | 2004-2007 |
2003-09-30 | Rhiner Cruz | Signed as nondrafted free agent by Tigers | P | 6-2 | 165 | R | R | 1986-11-01 | Santo Domingo,DR | 2003- 0- 0-DET
| MLB | 2012-2018 | 2004-2018 |
2003-09-23 | Sergio Contreras | Loaned by Angels to Mexico City Tigers (Mexican) April 28- | OF-1B | 5-11 | 180 | L | L | 1980-04-30 | Ciudad Obregon,MX |
| AAA | | 2000-2019 |
2003-09-12 | Luis Garcia | Loaned by Diamondbacks to Mexico City Tigers March 24- | OF-RF | 6-3 | 208 | R | R | 1975-09-22 | Hermosillo,MX | 1994- 19- 537-CHA
| MLB | 2002-2002 | 1995-2011 |
2003-09-03 | Cecilio Garibaldi | Loaned by Devil Rays to Mexico City Tigers March 21- | P | 6-2 | 214 | R | R | 1978-01-05 | Guasave,MX |
| AAA | | 1998-2015 |
2003-09-03 | Iker Franco | Loaned by Devil Rays to Mexico City Tigers March 19- | C-1B | 6-1 | 212 | R | R | 1981-05-05 | Ensenada,MX |
| AAA | | 2000-2019 |
2003-08-27 | Steve Sparks | Released by Tigers. | P-OF | 6-0 | 180 | R | R | 1965-07-02 | Tulsa,OK | 1987- 5- 123-MIL
| MLB | 1995-2004 | 1987-2004 |
2003-08-20 | John Ennis | Claimed on waivers by Tigers from Braves. | P | 6-5 | 220 | R | R | 1979-10-17 | Montrose,CO | 1998- 14- 431-ATL
| MLB | 2002-2007 | 1998-2010 |
2003-07-23 | Shane Heams | Released by Tigers | P-OF | 6-1 | 175 | R | R | 1975-09-29 | Toledo,OH | 1994- 41-1138-SEA
| AAA | | 1995-2005 |
2003-07-21 | Shane Heams | Signed by Tigers | P-OF | 6-1 | 175 | R | R | 1975-09-29 | Toledo,OH | 1994- 41-1138-SEA
| AAA | | 1995-2005 |
2003-07-16 | John Deering | Traded by Tigers to Yankees for Paddy Greene. | P | 6-0 | 180 | R | R | 1879-06-25 | Lynn,MA |
| MLB | 1903-1903 | 1903-1903 |
2003-07-16 | Paddy Greene | Traded by Yankees to Tigers for John Deering. | 3B-SS | 5-8 | 150 | R | R | 1875-03-20 | Providence,RI |
| MLB | 1902-1903 | 1902-1903 |
2003-07-13 | Ben Petrick | Traded by Rockies to Tigers for Adam Bernero. | C-OF | 6-0 | 199 | R | R | 1977-04-07 | Hillsboro,OR | 1995- 2- 38-COL
| MLB | 1999-2003 | 1996-2004 |
2003-07-13 | Adam Bernero | Traded by Tigers to Rockies for Ben Petrick. | P | 6-4 | 205 | R | R | 1976-11-28 | San Jose,CA | 1996- 38-1136-COL
| MLB | 2000-2006 | 1999-2008 |
2003-07-11 | Wendell Magee | Released by Tigers | OF-CF | 6-0 | 220 | R | R | 1972-08-03 | Hattiesburg,MS | 1994- 12- 338-PHI
| MLB | 1996-2002 | 1994-2005 |
2003-06-11 | Tonayne Brown | Traded by Red Sox to Tigers completing trade in which Tigers sent RHP Jerry Dunn to Red Sox for a player to be named (March 18 2003) | OF | 5-11 | 190 | R | L | 1977-08-24 | Tallahassee,FL | 1998- 36-1075-BOS
| AA | | 1998-2005 |
2003-06-10 | Sam Flamont | Released by Tigers | OF-2B | 6-0 | 210 | L | R | 1980-03-17 | Dearborn Heights,MI |
| A+ | | 2001-2005 |
2003-06-10 | Ernie Courtney | Traded by Yankees with Herman Long to Tigers for Kid Elberfeld. | 3B-1B | 5-8 | 168 | L | R | 1875-01-20 | Des Moines,IA |
| MLB | 1902-1908 | 1902-1908 |
2003-06-10 | Pat Lennon | Contract purchased by Tigers from Long Island | OF-3B | 6-2 | 230 | R | R | 1968-04-27 | Whiteville,NC | 1986- 1- 8-SEA
| MLB | 1991-1999 | 1986-2005 |
2003-06-10 | Kid Elberfeld | Traded by Tigers to Yankees for Ernie Courtney and Herman Long. | SS-3B | 5-7 | 158 | R | R | 1875-04-13 | Pomeroy,OH |
| MLB | 1898-1914 | 1898-1914 |
2003-06-10 | Herman Long | Traded by Yankees with Ernie Courtney to Tigers for Kid Elberfeld. | SS-2B | 5-8 | 160 | L | R | 1866-04-13 | Chicago,IL |
| MLB | 1889-1904 | 1889-1904 |
2003-06-09 | Kevin Jordan | Contract purchased by Tigers from Camden | 2B-3B | 6-1 | 201 | R | R | 1969-10-09 | San Francisco,CA | 1990- 20- 542-NYA
| MLB | 1995-2001 | 1990-2005 |
2003-06-03 | Randor Bierd | Signed as nondrafted free agent by Tigers | P | 6-4 | 190 | R | R | 1984-03-14 | Santo Domingo,DR | 2003- 0- 0-DET
| MLB | 2008-2008 | 2004-2010 |
2003-05-29 | Tom Evans | Released by Tigers. | 3B-1B | 6-1 | 200 | R | R | 1974-07-09 | Kirkland,WA | 1992- 4- 121-TOR
| MLB | 1997-2000 | 1992-2006 |
2003-05-27 | Alex Sanchez | Traded by Brewers to Tigers for Noochie Varner and Chad Petty. | OF-CF | 5-10 | 180 | L | L | 1976-08-26 | Havana,CU | 1996- 5- 154-TBA
| MLB | 2001-2005 | 1996-2013 |
2003-05-27 | Noochie Varner | Traded by Tigers with LHP Chad Petty to Brewers for OF Alex Sanchez | OF-3B | 6-0 | 185 | R | R | 1980-12-07 | Cynthiana,KY | 2000- 10- 303-CIN
| AAA | | 2000-2007 |
2003-05-27 | Chad Petty | Traded by Tigers with OF Noochie Varner to Brewers for OF Alex Sanchez | P | 6-4 | 200 | L | L | 1982-02-17 | Cleveland,OH | 2000- 2- 48-DET
| A+ | | 2000-2005 |
2003-05-24 | Adrian Burnside | Tigers acquired RHP Roberto Novoa and 3B Kody Kirkland to complete trade | P | 6-3 | 168 | R | L | 1977-03-15 | Alice Springs,AU |
| AAA | | 1996-2011 |
2003-05-24 | Kody Kirkland | Traded by Pirates to Tigers completing trade in which Tigers sent 1B Randall Simon to Pirates for LHP Adrian Burnside and two players to be named (Nov. 25 2002) | 3B-2B | 6-4 | 200 | R | R | 1983-06-09 | Pocatello,ID | 2001- 30- 894-PIT
| AAA | | 2002-2013 |
2003-05-22 | Jair Jurrjens | Signed as nondrafted free agent by Tigers | P | 6-1 | 160 | R | R | 1986-01-29 | Willemstad,CC | 2003- 0- 0-DET
| MLB | 2007-2014 | 2003-2018 |
2003-05-12 | Freddy Dolsi | Signed as nondrafted free agent by Tigers | P | 6-0 | 160 | R | R | 1983-01-06 | San Pedro de Macoris,DR | 2003- 0- 0-DET
| MLB | 2008-2009 | 2003-2011 |
2003-05-09 | Sendy Vasquez | Signed as nondrafted free agent by Tigers | P | 6-1 | 160 | B | R | 1982-08-10 | Hato Mayor del Rey,DR |
| A+ | | 2003-2011 |
2003-05-07 | Wendell Magee | Signed by Tigers | OF-CF | 6-0 | 220 | R | R | 1972-08-03 | Hattiesburg,MS | 1994- 12- 338-PHI
| MLB | 1996-2002 | 1994-2005 |
2003-04-29 | Craig Paquette | Released by Tigers. | 3B-1B | 6-0 | 190 | R | R | 1969-03-08 | Long Beach,CA | 1989- 8- 218-OAK
| MLB | 1993-2003 | 1989-2007 |
2003-04-27 | Dave Borkowski | Released by Tigers. | P | 6-1 | 200 | R | R | 1977-02-07 | Detroit,MI | 1995- 11- 294-DET
| MLB | 1999-2008 | 1995-2009 |
2003-04-25 | Dave Borkowski | Released by Tigers | P | 6-1 | 200 | R | R | 1977-02-07 | Detroit,MI | 1995- 11- 294-DET
| MLB | 1999-2008 | 1995-2009 |
2003-04-03 | Tyler Walker | Claimed on waivers by Tigers from Mets. | P | 6-3 | 237 | R | R | 1976-05-15 | San Francisco,CA | 1997- 2- 58-NYN
| MLB | 2002-2010 | 1996-2011 |
2003-04-02 | Cristhian Martinez | Signed as nondrafted free agent by Tigers | P | 6-1 | 160 | R | R | 1982-03-06 | Santo Domingo,DR | 2003- 0- 0-DET
| MLB | 2009-2013 | 2003-2013 |
2003-03-29 | Yohanny Valera | Signed by Tigers | C-1B | 6-1 | 200 | R | R | 1976-08-17 | Santo Domingo,DR | 1993- 0- 0-NYN
| MLB | 2000-2000 | 1995-2009 |
2003-03-29 | AJ Hinch | Purchased by Tigers from Indians. | C-OF | 6-1 | 207 | R | R | 1974-05-15 | Waverly,IA | 1996- 3- 75-OAK
| MLB | 1998-2004 | 1993-2005 |
2003-03-28 | Luke Carlin | Released by Tigers | C-1B | 5-11 | 180 | B | R | 1980-12-20 | Silver Spring,MD | 2002- 10- 290-DET
| MLB | 2008-2012 | 2000-2015 |
2003-03-28 | Robinson Cancel | Released by Tigers. | C-1B | 6-0 | 195 | R | R | 1976-05-04 | Lajas,PR | 1994- 16- 431-MIL
| MLB | 1999-2011 | 1994-2013 |
2003-03-28 | Jesse Carlson | Released by Tigers | P | 6-1 | 160 | L | L | 1980-12-31 | New Britain,CT | 2002- 15- 440-DET
| MLB | 2008-2010 | 2001-2012 |
2003-03-28 | Damion Easley | Released by Tigers. | 2B-SS | 5-11 | 185 | R | R | 1969-11-11 | New York,NY | 1988- 30- 767-CAL
| MLB | 1992-2008 | 1989-2008 |
2003-03-28 | Tim McClaskey | Released by Tigers | P | 5-10 | 170 | R | R | 1976-01-11 | Portsmouth,OH | 1995- 36- 989-MIA
| AAA | | 1996-2008 |
2003-03-28 | George Lombard | Claimed on waivers by Devil Rays from Tigers. | OF-LF | 6-0 | 202 | L | R | 1975-09-14 | Atlanta,GA | 1994- 2- 61-ATL
| MLB | 1998-2006 | 1994-2009 |
2003-03-27 | Bill Haselman | Released by Tigers. | C-DH | 6-3 | 223 | R | R | 1966-05-25 | Long Branch,NJ | 1987- 1- 23-TEX
| MLB | 1990-2003 | 1987-2003 |
2003-03-27 | Jeremy Lewis | Released by Tigers | P | 6-4 | 180 | R | L | 1980-09-12 | Concord,NC | 1999- 23- 687-DET
| A+ | | 1999-2011 |
2003-03-25 | Chris Spurling | Traded by Braves to Tigers for Matt Coenen. | P | 6-5 | 228 | R | R | 1977-06-28 | Dayton,OH | 1997- 41-1246-NYA
| MLB | 2003-2007 | 1998-2010 |
2003-03-25 | Matt Coenen | Traded by Tigers to Braves for RHP Chris Spurling March 25 2003 | P | 6-6 | 230 | L | L | 1980-03-13 | Green Bay,WI | 2001- 2- 65-DET
| AA | | 1999-2005 |
2003-03-23 | Kevin Barker | Released by Tigers. | 1B-OF | 6-3 | 205 | L | L | 1975-07-26 | Bristol,VA | 1996- 3- 73-MIL
| MLB | 1999-2009 | 1996-2011 |
2003-03-18 | Gus Marquetti | Released by Tigers | P | 6-6 | 220 | B | R | 1978-02-24 | Caracas,VZ |
| AA | | 2002-2009 |
2003-03-18 | Michael Smith | Released by Tigers | P | 6-5 | 205 | L | L | 1981-07-08 | Valdosta,GA | 2002- 16- 470-DET
| Rk | | 2002-2003 |
2003-03-18 | Gerald Dunn | Traded by Tigers to Red Sox for a player to be named March 18 2003 | P | 6-4 | 210 | R | R | 1981-06-30 | Charlotte,NC | 2000- 36-1068-DET
| A+ | | 2001-2010 |
2003-03-07 | Heinie Smith | Traded by Giants to Tigers for Kid Gleason. | 2B-P | 5-9 | 160 | R | R | 1871-10-24 | Pittsburgh,PA |
| MLB | 1897-1903 | 1897-1903 |
2003-03-07 | Kid Gleason | Traded by Tigers to Giants for Heinie Smith. | 2B-P | 5-7 | 158 | B | R | 1866-10-26 | Camden,NJ |
| MLB | 1888-1912 | 1888-1912 |
2003-02-26 | Oscar Bustillos | Contract purchased by Mexico City Tigers from Devil Rays | P | 5-11 | 180 | R | R | 1979-12-10 | Culiacan,MX |
| AAA | | 2000-2013 |
2003-02-05 | Wilkin Ramirez | Signed as nondrafted free agent by Tigers | LF-OF | 6-2 | 190 | R | R | 1985-10-25 | Bani,DR | 2003- 0- 0-DET
| MLB | 2009-2013 | 2003-2016 |
2003-02-03 | Kevin Witt | Signed as Free Agent by Tigers. | 1B-SS | 6-4 | 210 | L | R | 1976-01-05 | High Point,NC | 1994- 1- 28-TOR
| MLB | 1998-2006 | 1994-2007 |
2003-01-24 | Kevin Barker | Signed as Free Agent by Tigers. | 1B-OF | 6-3 | 205 | L | L | 1975-07-26 | Bristol,VA | 1996- 3- 73-MIL
| MLB | 1999-2009 | 1996-2011 |
2003-01-20 | Alex Lontayo | Signed by Tigers | P | 6-1 | 190 | L | L | 1975-12-12 | Colorado Springs,CO |
| AAA | | 1995-2005 |
2003-01-20 | Bill Haselman | Signed as Free Agent by Tigers. | C-DH | 6-3 | 223 | R | R | 1966-05-25 | Long Branch,NJ | 1987- 1- 23-TEX
| MLB | 1990-2003 | 1987-2003 |
2003-01-16 | Tom Evans | Signed as Free Agent by Tigers. | 3B-1B | 6-1 | 200 | R | R | 1974-07-09 | Kirkland,WA | 1992- 4- 121-TOR
| MLB | 1997-2000 | 1992-2006 |
2003-01-15 | Billy Munoz | Signed by Tigers | 1B-OF | 6-2 | 220 | L | L | 1975-06-30 | Yuma,AZ | 1994- 50-1347-MIN
| AAA | | 1998-2009 |
2003-01-11 | Nate Robertson | Traded by Marlins with Rob Henkel and Gary Knotts to Tigers for Jerrod Fuell and Mark Redman. | P | 6-2 | 215 | L | R | 1977-09-03 | Wichita,KS | 1999- 5- 146-MIA
| MLB | 2002-2010 | 1999-2014 |
2003-01-11 | Gary Knotts | Traded by Marlins with Rob Henkel and Nate Robertson to Tigers for Jerrod Fuell and Mark Redman. | P | 6-4 | 200 | R | R | 1977-02-12 | Decatur,AL | 1995- 11- 289-MIA
| MLB | 2001-2004 | 1996-2009 |
2003-01-11 | Mark Redman | Traded by Tigers with Jerrod Fuell to Marlins for Rob Henkel, Nate Robertson and Gary Knotts. | P | 6-5 | 220 | L | L | 1974-01-05 | San Diego,CA | 1995- 1- 13-MIN
| MLB | 1999-2008 | 1994-2008 |
2003-01-11 | Jerrod Fuell | Traded by Tigers with LHP Mark Redman to Marlins for RHP Gary Knotts LHP Nate Robertson and LHP Rob Henkel | P | 6-4 | 210 | R | R | 1980-10-03 | Grant,NM | 1999- 10- 297-DET
| AAA | | 1999-2007 |
2003-01-11 | Rob Henkel | Traded by Marlins with RHP Gary Knotts and LHP Nate Robertson to Tigers for LHP Mark Redman and RHP Jerrod Fuell | P | 6-2 | 210 | L | R | 1978-08-03 | La Mesa,CA | 2000- 3- 71-MIA
| AAA | | 2000-2007 |
2003-01-10 | Danny Klassen | Signed as Free Agent by Tigers. | SS-3B | 6-0 | 175 | R | R | 1975-09-22 | Leamington,ON | 1993- 2- 65-MIL
| MLB | 1998-2003 | 1993-2008 |
2003-01-07 | Adriano Santos | Signed as nondrafted free agent by Tigers | P | 6-2 | 170 | R | R | 1984-09-08 | Bani,DR |
| A+ | | 2004-2007 |
2003-01-07 | Robinson Cancel | Signed as Free Agent by Tigers. | C-1B | 6-0 | 195 | R | R | 1976-05-04 | Lajas,PR | 1994- 16- 431-MIL
| MLB | 1999-2011 | 1994-2013 |
2003-01-06 | Danny Klassen | Signed by Tigers | SS-3B | 6-0 | 175 | R | R | 1975-09-22 | Leamington,ON | 1993- 2- 65-MIL
| MLB | 1998-2003 | 1993-2008 |