Henryk Łowmiański (August 22, 1898 near Ukmergė - September 4, 1984 in Poznań) was a Polish historian of the medieval period. A researcher of ancient history of Poland, Lithuania and the Slavs in general, Łowmiański was the author of many works, including the 6 volume Początki Polski (English: The Beginnings of Poland").
After receiving his doctorate on the "Wschody" miast litewskich w XVI wieku (English: Beginnings of Lithuanian Cities), Łowmiański became the first history Ph.D in the University of Stefan Batory.
His wife was Maria Łowmiańska (1899-1961), a historian.