Maciej Kalenkiewicz (Polish pronunciation: ['mat???j kal?n'k??vit??]; 1906–1944; nom de guerre Kotwicz) was a Polish engineer and military officer, a podpulkownik of the Polish Army.
During World War II he received training as a Cichociemny and was delivered to occupied Poland, where he assumed command over the Nowogródek Home Army area.
He was one of the Polish commanders of the Operation Tempest and the Operation Ostra Brama.
Along with 39 Home Army soldiers under his command, he was killed on August 21, 1944 by the NKVD during the Battle at Surkonty.