Hjalmar Eilif Emanuel Peterssen (September 4, 1852 – December 29, 1928) was a Norwegian painter.
Hjalmar Eilif Emanuel Peterssen was born in Christiania, now Oslo, Norway. He grew up in the neighborhood of Hegdehaugen in the district of Frogner.
He attended the Johan Fredrik Eckersberg School of Painting in Oslo in 1869. In 1871 he left Oslo to study at the Art Academy in Copenhagen. Later that year he moved to Karlsruhe, where he was a student of Ludwig des Coudres and at Weimar Saxon-Grand Ducal Art School. In the fall of 1873 Peterssen traveled to Munich where he studied under Wilhelm von Diez and Franz von Lenbach. In Munich Peterssen met other famous artists such as Arnold Böcklin and Karl von Piloty. Eilif Peterssen was first married in 1879 to Inger Birgitte Cecilie Nicoline Bache Ravn (1850–1882), a daughter of the court marshal, Major General Johan Georg Boll Gram (1809–1873). After his wife died, he married for the second time in 1888 to Frederikke Magdalene ("Magda") Kielland (1855–1931), daughter of Lieutenant Commander Jacob Kielland (1825–1889).
Eilif Peterssen made several trips to France and Italy. In 1896 he went to Arques-la-Bataille in Normandy, where he painted several landscapes, and from France he went together with his family to Rome in 1897. In 1903 Peterssen again visited Italy and in Rapallo near Genova he painted the impressionist motif Winter in the South (Washerwomen in Rapallo). During the dissolution of Union between Sweden and Norway in 1905, Peterssen was commissioned to design the new coat of arms of Norway.