Marceli Harasimowicz (1859 in Warsaw – 1935 in Lwów) was a Polish landscape painter and museum curator.

From 1885, he lived and worked in Lwów, was the curator of the Municipal Art Gallery from 1907 to 1931 and was a member of the Polish Association of Artists.

Atmospheric representations of sunsets and the wetlands of Kashubia were among his most popular subjects, but he also painted extensively in Podhale, the Pieniny mountains and the Hutsul region.

He exhibited under the aegis of the Kraków Society of Friends of Fine Arts, in Vienna and Munich as well as Poland.

He also illustrated books and magazines and executed murals in the cathedral at Przemyśl.