Dyalma Augusto Federico Stultus (Trieste, 31 October 1901 - Darfo, 24 September 1977) was an Italian painter.
Son of Erminia Stultus and Ralph Pacor he enrolled at Academy of Fine Arts in Venice thanks to a grant obtained from the Municipality of Trieste. In 1922 he organized his first solo exhibition at Ca 'Pesaro. He then went to Trieste and then to Florence in the spring of 1927-1928, and Rome.
In 1930, in 1932 and in 1934 he exhibited at the Venice Biennale as well as in group exhibitions in New York, Budapest, Baltimore and Barcelona.