Kazimierz Wincenty Iranek-Osmecki (noms de guerre Kazimierz Jarecki, Włodzimierz Ronczewski, Makary, Antoni Heller, Pstrąg; 5 September 1897 – 22 May 1984, London) was an infantry colonel (pułkownik) in the Polish Army, and colonel in Poland's Home Army (AK).

Iranek-Osmecki commanded the Home Army General Staff's Section II (Intelligence and Counterintelligence), and was a Cichociemny.

[1] Born on September 5, 1897, in the village of Pstrągowa, Austrian Galicia, he attended the Second High School in Rzeszów, joining the Riflemen's Association in 1913.

For most of the early 1930s, he lectured at the military college, returning to active service in 1937, when he was named battalion commandant of the 36th Infantry Regiment (Poland).

In October 1939, Iranek-Osmecki was named deputy commandant of Bucharest officer of the Second Department of Polish General Staff.

In June 1940, after moving to France, he continued working at the Polish General Staff, responsible for communication with occupied Poland.

Between April 1943 – January 1944, he was a quartermaster of the Home Army, to be moved to intelligence and information department of the AK.