Weltklasse Zürich is an annual, invitation-only, world-class track and field meeting at the Letzigrund in Zürich, Switzerland, generally held at the end of August or beginning of September. Previously one of the IAAF Golden League events, it now serves as a final of the Wanda Diamond League, alongside Memorial Van Damme between 2010 and 2019. In 2021, Welklasse Zürich will serve as the sole final of the Diamond League. One of the first large-scale international athletics events, it is sometimes referred to as the one-day Olympics. Weltklasse Zürich first took place on 12 August 1928. In the beginning, the meeting was nicknamed by the public the "Nurmi meeting" after the most admired and celebrated participant at the time, Paavo Nurmi. On 21 June 1960, on the Letzigrund track, Armin Hary became the first human to run the 100 m dash in 10.0 seconds.

Letzigrund is a stadium in Zürich, Switzerland, the home of the football clubs FC Zürich and Grasshopper Club Zürich, as well as the athletics club LC Zürich. The stadium was constructed by members of FC Zürich in 1925. Grasshopper Club has been using it as their home stadium since 2007. LC Zürich was spun off of FC Zürich in 1934. The annual track and field meet Weltklasse Zürich, part of the Diamond League, has taken place at the Letzigrund since 1928, as have frequent open-air concerts. On the Letzigrund track on 21 June 1960, Armin Hary was the first human being to run the 100 metres in 10.0 seconds.