Šimun Debelić (26 January 1902 – May 1945) was a Croatian veterinarian and professor at the University of Zagreb.
He was born in Prkovci, finished local schooling in 1912, and a gymnasium in Vinkovci in 1920.
He studied to be a veterinarian at the University of Zagreb, graduating in 1926 and achieving a doctorate by 1928.
He went to the United States of America in 1930 for specialization, and later to Germany and Switzerland as well in 1931 and 1932.
In the Banovina of Croatia he headed the Veterinary Department and from 1941 he served as undersecretary in the Independent State of Croatia's Ministry of National Economy.