The 2017–18 Central Coast Mariners FC season was the club's 13th season since its establishment in 2004.

The club participated in the A-League for the 13th time and the FFA Cup for the 4th time.

Immediately after the end of the 2016–17 season, it was announced that goalkeepers Paul Izzo and Ivan Necevski; and attacking players Roy O'Donovan and Fábio Ferreira would be leaving the club.

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

Players may hold more than one non-FIFA nationality.