The German Open[1] (previously known as the Grass Court Championships Berlin, bett1open, and since 2024 the Berlin Ladies Open) is a WTA Tour affiliated professional tennis tournament for women played in West Berlin, West Germany (until 1990), then Berlin, Germany from 1991 to 2008 following reunification.

From 1988, it was classified on the WTA Tour as a Tier I tournament.

After an absence of more than a decade, the tournament was announced to return to the WTA calendar for the 2020 season.

The new event is classified as a Premier-level tournament and serve as a warm-up event towards the Wimbledon Championships, having switched its surface from clay to grass.

[2][3] Past champions of the tournament include former world number ones Billie Jean King, Chris Evert, Steffi Graf, Monica Seles, Arantxa Sánchez Vicario, Martina Hingis, Amélie Mauresmo, Justine Henin, Ana Ivanovic and Dinara Safina.