Head to Head
| Spain Segunda B Group 2 | 2020/10/25 16:00 | Leioa v Real Unión | W | 0-1 |
| Spain Segunda B Group 2 | 2019/12/01 16:00 | Real Unión v Leioa | D | 0-0 |
| Spain Segunda B Group 2 | 2019/01/26 15:00 | Leioa v Real Unión | W | 0-1 |
| Spain Segunda B Group 2 | 2018/09/09 16:00 | Real Unión v Leioa | L | 1-2 |
| Spain Segunda B Group 2 | 2018/04/07 16:00 | Leioa v Real Unión | D | 0-0 |
| Spain Segunda B Group 2 | 2017/11/12 16:00 | Real Unión v Leioa | L | 1-3 |
| Spain Segunda B Group 2 | 2017/02/18 15:00 | Leioa v Real Unión | L | 2-0 |
| Spain Segunda B Group 2 | 2016/10/02 15:00 | Real Unión v Leioa | W | 2-1 |
Home History
| Spain Segunda B Group 2 | 2020/11/18 16:00 | Real Unión v Alaves B | L | 1-2 |
| Spain Segunda B Group 2 | 2020/11/15 16:00 | Real Unión v Barakaldo | W | 2-1 |
| Spain Segunda B Group 2 | 2020/11/08 17:00 | Laredo v Real Unión | L | 1-0 |
| Spain Segunda B Group 2 | 2020/10/25 16:00 | Leioa v Real Unión | W | 0-1 |
| Spain Segunda B Group 2 | 2020/03/07 15:00 | Athletic Bilbao B v Real Unión | D | 3-3 |
| Spain Segunda B Group 2 | 2020/02/29 15:15 | Valladolid Promesas v Real Unión | L | 1-0 |
| Spain Segunda B Group 2 | 2020/02/23 16:00 | Real Unión v Amorebieta | L | 0-1 |
| Spain Segunda B Group 2 | 2020/02/15 15:00 | Arenas Club de Getxo v Real Unión | D | 0-0 |
Away History
| Spain Copa Federacion | 2020/11/19 11:00 | Las Rozas v Leioa | L | 1-0 |
| Spain Segunda B Group 2 | 2020/11/15 10:30 | Portugalete v Leioa | L | 1-0 |
| Spain Copa Federacion | 2020/11/11 18:00 | Leioa v Tropezon | W | 2-1 |
| Spain Segunda B Group 2 | 2020/10/25 16:00 | Leioa v Real Unión | L | 0-1 |
| Spain Copa Federacion | 2020/10/22 17:00 | Leioa v UP Langreo | W | 2-0 |
| Spain Segunda B Group 2 | 2020/10/18 15:00 | Real Sociedad B v Leioa | L | 1-0 |
| Spain Copa Federacion | 2020/10/10 15:00 | Leioa v Caudal | W | 1-0 |
| Europe Friendlies | 2020/09/26 15:00 | Leioa v Arenas Club de Getxo | W | 2-1 |