The 2018 Open de Cagnes-sur-Mer was a professional tennis tournament played on outdoor clay courts. It was the twenty-first edition of the tournament and was part of the 2018 ITF Women's Circuit. It took place in Cagnes-sur-Mer, France, on 7–13 May 2018.
Singles main draw entrants
Seeds
1 Rankings as of 30 April 2018.
Other entrants
The following players received a wildcard into the singles main draw: Eugenie Bouchard Fiona Ferro Amandine Hesse Andrea Petkovic
The following players received entry from the qualifying draw: Alexandra Dulgheru Bibiane Schoofs Daniela Seguel Dayana Yastremska
The following players received entry as lucky losers: Jaimee Fourlis Priscilla Hon
Champions
Singles
Rebecca Peterson def. Dayana Yastremska, 6–4, 7–5
Doubles
Kaitlyn Christian / Sabrina Santamaria def. Vera Lapko / Galina Voskoboeva, 2–6, 7–5, [10–7]