The 2017–18 Women's LEN Trophy was the 19th edition of the European second-tier tournament for women's water polo clubs.

[1][2] Dunaújváros achieved the first continental trophy of its history.

The Hungarian team won the semifinal against host CN Mataró and the final match against Greece's Olympiacos.

[3][4] The tournament was contested by the four teams eliminated from the Euro League's quarterfinals.

Mataró was chosen by LEN as host of tournament on 20 March, while the draw was held during Europa Cup's Superfinal, in Pontevedra, on 24 March 2018.