The 2021 Doha Diamond League was the 23rd edition of the annual outdoor track and field meeting in Doha, Qatar. Held on 28 May at the Suheim bin Hamad Stadium, it was the second leg of the 2021 Diamond League – the highest level international track and field circuit.

The meeting was highlighted by Faith Kipyegon's 1:58.26 victory in the 800 metres, done in an unusual negative split of 60.8 seconds for the first lap followed by 57.4 seconds for the final lap.

Athletes competing in the Diamond League disciplines earned extra compensation and points which went towards qualifying for the Diamond League finals in Zürich. First place earned 8 points, with each step down in place earning one less point than the previous, until no points are awarded in 9th place or lower.

The top-3 athletes in throwing and horizontal jumping events are ranked by the "Final 3" format, with their best mark overall in italics if it differs from their final trial.