During the 2017–18 season, Ajax participated in the Eredivisie and the KNVB Cup.

This marked the first time that Ajax did not qualify for the group stage of a UEFA club competition since the 1990–91 season, when they were excluded from competing in European football for a year due to the staafincident.

Appearances for competitive matches only As of 6 May 2018 Eredivisie KNVB Cup UEFA Champions League UEFA Europa League All times are in CEST

For a list of all Dutch football transfers in the summer window (1 July 2017 to 31 August 2017) please see List of Dutch football transfers summer 2017.

For a list of all Dutch football transfers in the winter window (1 January 2018 to 1 February 2018) please see List of Dutch football transfers winter 2017–18.