Erno Erb was a Polish painter of Jewish origin.

He was born in 1878 in an assimilated family of Lviv Jews. Some sources state that he was born in 1890. He spent almost all his life in Lviv and Truskavets. He painted city motifs, genre scenes, marketplaces, characteristic types of Ukrainian peasants and Jews, landscapes and still lifes. He most often used oil paints, although he also created watercolors and pastels. His oil paintings, characterized by a rich texture of coarsely applied paint, are compared with the works of the German painter Max Liebermann.

Erb repeatedly exhibited in The Society of Friends of Fine Arts in Lviv and Krakow and in the Zachęta Gallery in Warsaw. In 1929 he took part in the General National Exhibition in Poznań, and in 1932 in the Exhibition of Polish Art in Buffalo. He probably died during the liquidation of the Lviv ghetto. His works are in the National Museum in Krakow, the collections of the Jewish Institute in Warsaw, the Historical Museum in Krakow, the Museum of Ukrainian Art in Lviv and the Lviv Picture Gallery.