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.

The IAAF Golden League was an annual series of outdoor track and field meetings organised by the International Association of Athletics Federations (IAAF). Athletes who won specific events at all of the series meetings were awarded a jackpot prize, sometimes given in gold bars, which inspired the series name. The competition began with seven meetings and it lasted for twelve years as the IAAF's top tier of one-day meetings. Within the IAAF's global circuit, athletes received additional points for their performances at the Golden League for the IAAF Grand Prix (1998–2002), IAAF World Outdoor Meetings (2003–2005), then IAAF World Athletics Tour (2006–2009). The Golden League was replaced in 2010 by the Diamond League, which marked an expansion to fourteen seasonal meetings covering all track and field events except the hammer throw.