The Star Alliance is the world’s largest global airline alliance, ahead of SkyTeam and Oneworld, and is headquartered in Frankfurt am Main, Germany. It was founded in 1997, with its name and emblem representing the five founding airlines. Star Alliance has since grown considerably and its current membership includes 27 airlines. Star Alliance operates with the slogan: The Way The Earth Connects.
Source: Wikipedia

Full members and some of their affiliates:
– Adria Airways
– Aegean Airlines
– Air Canada (founding member)
– Air China
– Air India
– Air New Zealand
– All Nippon Airways
– Asiana Airlines
– Austrian Airlines
– Avianca, including Avianca Brazil
– Brussels Airlines
– Copa Airlines
– Croatia Airlines
– EgyptAir
– Ethiopian Airlines
– EVA Air, including Uni Air
– LOT Polish Airlines, including Eurolot
– Lufthansa (founding member), including Eurowings and Air Dolomiti
– Scandinavian Airlines (founding member)
– Shenzhen Airlines
– Singapore Airlines, including SilkAir
– South African Airways
– Swiss International Airlines
– TAP Portugal, including Portugalia
– Thai Airways International (founding member)
– Turkish Airlines, including Anadolu Jet and Sun Express
– United Airlines (founding member)

Former members and some of their affiliates:
– Ansett Australia
– Blue 1
– British Midland International
– Continental Airlines
– Mexicana
– Shanghai Airlines
– Spanair
– TACA Airlines, including Aviateca
– TAM Airlines
– US Airways
– VARIG, including Nordeste, Rio Sul and PLUNA