Face à face
| Segunda B, Relegation Group 2 | 2020/10/25 16:00 | Leioa v Real Unión | W | 0-1 |
| Segunda B, Relegation Group 2 | 2019/12/01 16:00 | Real Unión v Leioa | D | 0-0 |
| Segunda B, Relegation Group 2 | 2019/01/26 15:00 | Leioa v Real Unión | W | 0-1 |
| Segunda B, Relegation Group 2 | 2018/09/09 16:00 | Real Unión v Leioa | L | 1-2 |
| Segunda B, Relegation Group 2 | 2018/04/07 16:00 | Leioa v Real Unión | D | 0-0 |
| Segunda B, Relegation Group 2 | 2017/11/12 16:00 | Real Unión v Leioa | L | 1-3 |
| Segunda B, Relegation Group 2 | 2017/02/18 15:00 | Leioa v Real Unión | L | 2-0 |
| Segunda B, Relegation Group 2 | 2016/10/02 15:00 | Real Unión v Leioa | W | 2-1 |
Home History
| Segunda B, Relegation Group 2 | 2021/01/16 15:00 | Deportivo Alaves B v Real Unión | W | 0-1 |
| Segunda B, Relegation Group 2 | 2021/01/13 18:00 | Racing Santander v Real Unión | W | 1-3 |
| Segunda B, Relegation Group 2 | 2021/01/10 17:00 | Athletic Bilbao B v Real Unión | D | 0-0 |
| Segunda B, Relegation Group 2 | 2020/12/20 16:00 | Real Unión v Portugalete | W | 2-1 |
| Segunda B, Relegation Group 2 | 2020/12/05 14:45 | Real Unión v Arenas Club de Getxo | D | 1-1 |
| Segunda B, Relegation Group 2 | 2020/11/28 14:45 | Amorebieta v Real Unión | L | 1-0 |
| Segunda B, Relegation Group 2 | 2020/11/22 11:00 | Real Sociedad B v Real Unión | W | 0-1 |
| Segunda B, Relegation Group 2 | 2020/11/18 16:00 | Real Unión v Deportivo Alaves B | L | 1-2 |
Away History
| Segunda B, Relegation Group 2 | 2021/01/16 14:45 | Leioa v Real Sociedad B | D | 1-1 |
| Segunda B, Relegation Group 2 | 2021/01/09 14:45 | Leioa v Barakaldo | D | 2-2 |
| Segunda B, Relegation Group 2 | 2020/12/20 16:00 | Laredo v Leioa | L | 2-1 |
| Espagne - Copa del Rey | 2020/12/16 20:00 | Leioa v Villarreal | L | 0-6 |
| Segunda B, Relegation Group 2 | 2020/12/06 16:00 | Leioa v Amorebieta | D | 1-1 |
| Segunda B, Relegation Group 2 | 2020/12/02 18:00 | Leioa v Racing Santander | W | 1-0 |
| Segunda B, Relegation Group 2 | 2020/11/28 15:00 | Deportivo Alaves B v Leioa | D | 0-0 |
| Segunda B, Relegation Group 2 | 2020/11/25 18:00 | Arenas Club de Getxo v Leioa | L | 1-0 |
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