The structure, opening in July, comprises large timber planks and multiple glass planes that soar and swoop at different angles.
It is the ninth in a series of temporary summer buildings commissioned by the Serpentine Gallery.
Mr Gehry, 79, is most famous for the titanium-clad curved walls of the Guggenheim museum, which opened in Bilbao, Spain, in 1997.
Designs include terraced seating on either side of the structure and five elevated seating pods, which can be used as stages, private viewing platforms and dining areas.
The Canadian-born architect, now based in the US, has never had a structure built in England before.
He said: “The pavilion is designed as a wooden timber structure that acts as an urban street running from the park to the existing gallery.
“Inside the pavilion, glass canopies are hung from the wooden structure to protect the interior from wind and rain and provide for shade during sunny days.
“The pavilion is much like an amphitheatre, designed to serve as a place for live events, music, performance, discussion and debate.”