Pietro Marussig (16 May 1879 – 13 October 1937) was an Italian painter.

He was born inTrieste, Italy, and initially took lessons there fromEugenio Scomparini. He worked in Trieste from 1898 until 1918, and in Milan from 1919 until 1937. He painted in a representative expressionist style, depictinggenre scenes,vedute, and portraits.^[1] He was part of a group of Milanese artists known as theNovecento Italiano who exhibited at the Permanente of Milan in 1926 and 1929, and includedAnselmo Bucci,Leonardo Dudreville,Achille Funi,Gian Emilio Malerba,Ubaldo Oppi, andMario Sironi. The group had fascist leanings and were cohered byLino Pesaro, a gallery owner, andMargherita Sarfatti, a writer and art critic who would becomeMussolini's mistress. Piero established circa 1930, a school in Milan along with Funi and Bortolotti.^[2]