The 2017–18 season was the 119th in Athletic Club’s history and the 87th in the top tier.

[4] Unai Núñez wore number 12 in domestic matches from the beginning of 2018.

Iñigo Martínez' and Iñaki Williams' yellow cards against Celta Vigo on matchday 30 were removed in April 2018.

[5] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

[6] Source: Competitions League table