The 2019 Herculis was the 33rd edition of the annual outdoor track and field meeting in Monaco. Held from 11–12 July at Stade Louis II, it was the ninth leg of the 2019 IAAF Diamond League – the highest level international track and field circuit. 15 events were contested with 13 of them being point-scoring Diamond League disciplines. Most events were held on 12 July, except for the women's triple jump, which was held on 11 July at Port Hercules. Also in the women's events, Sydney McLaughlin won the 400 m hurdles in a world leading time of 53.32.