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 International (TI) is an annual esports world championship for the five-on-five video game Dota 2. Produced by the game's developer Valve, the International is the final event of the Dota Pro Circuit (DPC) and consists of 20 teams: 12 based on final results from the DPC; six from North America, South America, Southeast Asia, China, Eastern Europe, and Western Europe regional leagues; and two from last-chance qualifiers. The International was first held at Gamescom in 2011 to promote the game's release. It was then held annually in Seattle, where Valve is headquartered, until it began to be hosted internationally again starting with The International 2018.