Gustaf Samuel Bertil Oscarsson af Ugglas (July 3, 1934–1977) was Party Secretary of the Swedish Moderate Party between 1969 and 1974 and a member of the Swedish Riksdag.
He was married to Margaretha af Ugglas, Swedish foreign minister 1991-94, sister of businessman Jan Stenbeck. A fight between the families concerning the Stenbeck company Investment AB Kinnevik, however, prevented Bertil af Ugglas from meeting his famous brother-in-law very often.