The 2017–18 LEN Euro League Women was the 31st edition of the top tier European tournament for women's water polo clubs. It ran from 1 December 2017 to 21 April 2018. Defending champions Kinef Kirishi hosted the Final 4 on 20 and 21 April 2018 at their home pool. The russian team won the trophy for the second year in a row, defeating in the final game Spain's CN Sabadell.