Listed below is a profile for every player in Boro's squad as registered with the Premiership for the 2005/06 season.
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The national flags represent the international recognition that the player has achieved, or is expected to receive, and does not always represent the country of birth.
Click on players name for profile.
| 1 | 
| Mark Schwarzer | D.O.B : | 6/10/1972 | | Birthplace : | Sydney | | Position : | Goalkeeper |
| 2 | | Vacant | D.O.B : | | | Birthplace : | | | Position : | |
| 3 | 
| Franck Queudrue | D.O.B : | 27/8/1978 | | Birthplace : | Paris | | Position : | Defender |
| 4 | 
| Ugo Ehiogu | D.O.B : | 3/11/1972 | | Birthplace : | Hackney | | Position : | Defender |
| 5 |
| Chris Riggott | D.O.B : | 1/9/1980 | | Birthplace : | Derby | | Position : | Defender |
| 6 |
| Gareth Southgate | D.O.B : | 3/9/1970 | | Birthplace : | Watford | | Position : | Defender |
| 7 | 
| George Boateng | D.O.B : | 2/9/1975 | | Birthplace : | Accra | | Position : | Midfielder |
| 8 | | Vacant | D.O.B : | | | Birthplace : | | | Position : | |
| 9 |
| Jimmy Floyd Hasselbaink | D.O.B : | 27/3/1972 | | Birthplace : | Paramaribo | | Position : | Striker |
| 10 | 
| Fabio Rochemback | D.O.B : | 10/12/1981 | | Birthplace : | Soledade | | Position : | Midfielder |
| 11 |
| Malcolm Christie | D.O.B : | 11/4/1979 | | Birthplace : | Peterborough | | Position : | Striker |
| 12 | 
| Emanuel Pogatetz | D.O.B : | 16/1/1983 | | Birthplace : | Graz | | Position : | Defender |
| 14 | 
| Gaizka Mendieta | D.O.B : | 27/3/1974 | | Birthplace : | Bilbao | | Position : | Midfielder |
| 15 |
| Ray Parlour | D.O.B : | 7/3/1973 | | Birthplace : | Romford | | Position : | Midfielder |
| 16 | 
| Joseph-Desire Job
(on loan to Al-Ittihad) | D.O.B : | 1/12/1977 | | Birthplace : | Venissieux | | Position : | Striker |
| 17 |
| Doriva | D.O.B : | 28/5/1972 | | Birthplace : | Sau Paulo | | Position : | Midfielder |
| 18 | 
| Massimo Maccarone | D.O.B : | 6/9/1979 | | Birthplace : | Galliate | | Position : | Striker |
| 19 |
| Stewart Downing | D.O.B : | 22/7/1984 | | Birthplace : | Middlesbrough | | Position : | Midfielder |
| 20 | 
| Aiyegbeni Yakubu | D.O.B : | 22/11/1982 | | Birthplace : | Benin | | Position : | Striker |
| 21 |
| Stuart Parnaby | D.O.B : | 19/7/1982 | | Birthplace : | Durham | | Position : | Defender |
| 22 |
| Brad Jones | D.O.B : | 19/3/1982 | | Birthplace : | Armadale | | Position : | Goalkeeper |
| 23 |
| Colin Cooper | D.O.B : | 28/2/1967 | | Birthplace : | Sedgefield | | Position : | Defender |
| 24 |
| Andrew Davies
(on loan to Derby) | D.O.B : | 17/12/1984 | | Birthplace : | Stockton | | Position : | Defender |
| 25 |
| James Morrison | D.O.B : | 25/5/1986 | | Birthplace : | Darlington | | Position : | Midfielder |
| 26 |
| Matthew Bates | D.O.B : | 10/12/1986 | | Birthplace : | Middlesbrough | | Position : | Midfielder |
| 27 |
| Ross Turnbull
(on loan to Crewe) | D.O.B : | 4/1/1985 | | Birthplace : | Newton Aycliffe | | Position : | Goalkeeper |
| 28 |
| Andrew Taylor
| D.O.B : | 1/8/1986 | | Birthplace : | Hartlepool | | Position : | Midfielder |
| 29 |
| Tony McMahon | D.O.B : | 24/3/1986 | | Birthplace : | Bishop Aukland | | Position : | Defender |
| 30 |
| Danny Graham
(on loan to Derby) | D.O.B : | 12/8/1985 | | Birthplace : | Wallsend | | Position : | Striker |
| 31 |
| David Wheater | D.O.B : | 14/2/87 | | Birthplace : | Redcar | | Position : | Defender |
| 32 |
| David Knight | D.O.B : | 15/1/87 | | Birthplace : | Houghton | | Position : | Goalkeeper |
| 34 |
| Jason Kennedy | D.O.B : | 11/9/86 | | Birthplace : | Stockton | | Position : | Midfielder |
| 36 |
| Mark Viduka | D.O.B : | 9/10/1975 | | Birthplace : | Melbourne | | Position : | Striker |
| 37 |
| Adam Johnson | D.O.B : | 17/7/87 | | Birthplace : | Sunderland | | Position : | Midfielder |
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