Norwegian botanist (1867-1953).
Simen Oscar Fredrik Omang (23 March 1867 – November 1953) was a Norwegian botanist and educator whose work focused on the taxonomy of the hawkweed genus Hieracium, one of the most taxonomically complex plant groups in Scandinavian flora. Over a career spanning more than five decades, Omang documented, classified, and named about 2,250 different plant taxa within this genus, establishing himself as a leading authority on Nordic hawkweeds. He combined his botanical research with a teaching career until 1927, after which he devoted himself exclusively to botanical studies until his death.