Giuseppe Tominz, also known as Jožef Tominc, was an Italian-Slovene painter from the Austrian Littoral. He worked mostly in the cultural milieu of the upper bourgeoisie in the Austrian Illyrian Kingdom. He was one of the most prominent portraitists of the Biedermeier period. He became renowned for his realistic portraits. He worked mostly in the Austrian Littoral, but also produced religious paintings in Carniola and in Croatia. His handiwork can be seen in the Church of the Birth of the Blessed Virgin Mary in Donji Stoliv. Nowadays, many of his works are on display in the Revoltella Museum in Trieste, some in the National Gallery of Slovenia in Ljubljana, National Museum of Serbia and in the Museum of History and Art of Gorizia. He is considered part of both the Italian and the Slovenian national culture canon.

Giuseppe Tominz was born in Gorizia as the second of eleven children of Ivano Tominz, a dealer in ironware, and his wife Maria Anna (née Gioacchini) of Udine. He was educated in a bilingual environment. He attended a primary school run by Piarists in Gorizia, where he began to learn to paint in the third year. He received his first training as a painter from the local artist Karel Keber and probably also from the painter Franz Caucig.

In 1809, he left for Rome with the help of Austrian Archduchess Maria Anna, sister of Emperor Francis I of Austria, and count Francesco della Torre. In Rome, he studied painting with Domenico Conti Bazzani and in the Scuola del Nudo at the Accademia di San Luca. In 1814, he was awarded a silver medal for his drawing Study of the Apostople.

In 1816, he married Maria Ricci. In 1818, they had twin sons. That year, Tominz returned with his family to Gorizia. Of his early artistic works, several anatomical studies, sketches and one of his landscapes View of Vietri, Rieti and the Salerno Bay have survived.

In 1819, Tominz lived for some time in Vienna. From 1821 to 1823, he lived occasionally in Ljubljana, where he exhibited his works and painted portraits of nobles, members of the bourgeoisie, religious dignitaries and participants at the Congress of Laibach. Between 1830 and 1855, he lived and worked in Trieste. He later moved back to Gorizia, and finally to his estate in Gradišče nad Prvačino (Gradiscutta, in Italian), where he died in 1866.