2021 Weltklasse Zürich

The 2021 Weltklasse Zürich was an outdoor track and field meeting in Zürich, Switzerland. Held on 28–29 August 2021 at the Letzigrund, it served as the finals of the 2021 Diamond League – the highest level international track and field circuit. It was the first time that Zürich exclusively hosted the Diamond League finals, as the 2020 Diamond League finals were cancelled due to COVID-19. It was also hailed as the best single-weekend track and field event of the year 2021.

The first day was highlighted by Ryan Crouser winning his first shot put Diamond League title, and Berihu Aregawi and Francine Niyonsaba winning the new road 5K finals. On the second day in the 1500 metres races, women's 1500 m Olympic champion Faith Kipyegon beat World champion Sifan Hassan, but on the men's side the reverse happened as World champion Timothy Cheruiyot bested Olympic champ Jakob Ingebrigtsen.