Here is a short list of some famous architects. Do not limit yourself to this list.
Adolf Loos
Albert Kahn
Aldo Rossi
Alvar Aalto
Alvaro Siza
Antonio Gaudi
Carlo Scarpa
Craig Steely
Daniel Libeskind
Eliel Saarinen
Frank Lloyd Wright
Frank Owen Gehry
Fumihiko Maki
Gottfried Boehm
Henry Hobson Richardson
Christopher Wren
Ieoh Ming Pei
James Stirling
Jean Nouvel
Julia Morgan
Kenzo Tange
Kevin Roche
Le Corbusier
Louis Henry Sullivan
Louis Isadore Kahn
Ludwig Mies van der Rohe
Luis Barragan
Marcel Breuer
Mario Botta
Michael Graves
Oscar Niemeyer
Renzo Piano
Richard Meier
Robert Venturi
Tadao Ando