Robert Deodaat Emile Oxenaar is a Dutch graphic artist.
Ootje Oxenaar studied visual arts at the Royal Academy of Art in The Hague starting in 1947.
From 1966 until 1985 he worked for the Nederlandsche Bank, where he designed two series of well known banknotes. He is the former Director of Art and Design, Post and Telecommunications of The Netherlands. Oxenaar taught at the Rhode Island School of Design (RISD) in the graphic design department.
Oxenaar is married to Dawn Barrett, designer and president of Massachusetts College of Art and Design.