The ATP Nice Open (or Open de Nice Côte d'Azur in French) was an ATP World Tour 250 series and, formerly, Grand Prix tennis circuit affiliated men's tennis tournament. It was held in Nice, France at the Nice Lawn Tennis Club and played on outdoor clay courts. The last singles champion is Dominic Thiem from Austria.
Originally part of the Grand Prix tennis circuit between 1970 and 1989. The event was played under various (sponsored) names from 1971 through 1995. In 2010 Nice became the location of a World Tour 250 series clay court tournament, replacing the Interwetten Austrian Open in Kitzbühel, Austria on the ATP calendar. It was scheduled a week before the French Open. In November 2016 it was announced that the tournament would be replaced on the 2017 calendar by a new event in Lyon because the venue in Nice at the Nice Lawn Tennis Club could not be expanded.Ilie Năstase, Björn Borg, Henri Leconte and Dominic Thiem have each won the singles title twice.