The 2017–18 EHF Champions League was the 25th edition of Europe's premier club handball tournament.

Győri Audi ETO KC defended their title by defeating HC Vardar in the final.

[1] 16 teams participated in the competition, divided in four groups who played in a round robin, home and away format.

After the quarterfinals, the culmination of the season, the WOMEN'S EHF FINAL4, will continue in its existing format, with the four top teams from the competition competing for the title.

During the group stage, only criteria 4–5 apply to determine the provisional ranking of teams.