1930-31 Squad
| NO. | NAME | POS | HEIGHT | WEIGHT | DOB | AGE | BIRTHPLACE | PREFERRED FOOT | |
|---|---|---|---|---|---|---|---|---|---|
 | I. María Aguirrezabala | FW | 5/10/1909 | 21 | Galdakao | ||||
| | J. Bilbao | DF | 9/5/1900 | 29 | Erandio | ||||
| | G. Blasco | GK | 6/10/1909 | 21 | Mundaka | ||||
| | M. Castaños | MF | 2/13/1906 | 24 | Bilbao | ||||
| | J. Maria Castellanos | DF | 4/8/1909 | 21 | Bilbao | ||||
| | A. González de Careaga | DF | 4/27/1906 | 24 | Bilbao | ||||
| | R. de la Fuente | FW | 12/31/1907 | 22 | Bilbao | ||||
| | L. María de Uribe | FW | 10/17/1906 | 23 | Urduliz | ||||
| | R. Echevarría | MF | 5/6/1908 | 22 | Eibar | ||||
| | D. Felipés | FW | 4/20/1908 | 22 | Portugalete | ||||
| | J. Garizurieta | MF | 11/27/1908 | 21 | Erandio | ||||
| | G. Gorostiza | FW | 2/15/1909 | 21 | Santurtzi | ||||
| | J. Iraragorri | FW | 1.78 m | 75 kg | 3/16/1912 | 18 | Basauri | ||
| | J. Luis Ispizua | GK | 10/1/1908 | 21 | Bilbao | ||||
| | J. Moronati | DF | 3/27/1911 | 19 | Bilbao | ||||
| | J. Muguerza | MF | 9/15/1911 | 18 | Eibar | ||||
| | Á. María Rousse | DF | 10/1/1902 | 27 | Bilbao | ||||
| | A. Sauto | FW | 5/11/1908 | 22 | Barakaldo | ||||
| | V. Unamuno | FW | 5/21/1909 | 21 | Bergara | ||||
| | J. José Urquizu | DF | 6/24/1901 | 29 | Ondarroa | ||||
| | M. Vidal | GK | 10/15/1901 | 28 | Bilbao |
