The International 2019 (TI9) was the ninth iteration of The International, an annual Dota 2 world championship esports tournament. Hosted by Valve, the game's developer, the tournament followed a year-long series of awarding qualifying points, known as the Dota Pro Circuit (DPC), with the top 12 ranking teams being directly invited to the tournament, which took place in August 2019 at the Mercedes-Benz Arena in Shanghai. In addition, six more teams earned invites through regional qualifiers played in July 2019. The grand finals took place between Team Liquid and OG, who had respectively won the International's 2017 and 2018 events. There, OG defeated Team Liquid 3–1 in the best-of-five series to become the first-ever repeat champion of an International.

The Mercedes-Benz Arena, formerly known as the Shanghai World Expo Cultural Center, is an indoor arena located on the former grounds of Expo 2010 in Pudong, Shanghai. It is owned and operated by the AEG-OPG joint venture.