Star Alliance is an airline alliance headquartered in Frankfurt am Main, Germany. Founded on 14 May 1997, it was the world's first global airline alliance. As of April 2024, it is also the world's largest airline alliance by market share, holding 17.4%, compared to 13.7% for SkyTeam and 11.9% for Oneworld.

Star Alliance has 25 member airlines that operate a combined fleet of over 5,000 aircraft, serving more than 1,290 airports in 195 countries on more than 19,000 daily departures. The alliance has a two-tier rewards program, Silver and Gold, with incentives including priority boarding and upgrades. Like other airline alliances, Star Alliance airlines share airport terminals (known as co-locations), and many member planes are painted in the alliance's livery.