Robert Haas may refer to:

• Robert Haas (musicologist) (1886–1960), Austrian musicologist
• Robert Haas (calligrapher) (1898–1997), American calligrapher, typographer, photographer and book designer
• Robert Haas (clergyman), German clergyman and ecumenist
• Robert C. Haas, American law enforcement official in Cambridge, Massachusetts
• Robert M. Haas (1889–1962), American art director
• Bob Haas (born 1942), owner and executive of Levi Strauss & Co
• Robert Haas (investor) (1947–2021), American investor, photographer and motorcycle collector
• Robert Z. Haas, American vinter of the Tablas Creek Vineyard