Alecu Ioan Sion (September 28, 1890 – November 24, 1942) was a Romanian soldier and a general in the Land Forces.
Born in Pite?ti, he attended the military school for artillery and engineers officers from 1909 to 1911 and the Military Academy from 1921 to 1923.
He entered the army as a second lieutenant in 1911, taking part in World War I.
He became a lieutenant colonel in 1931 and a colonel in 1937.
He commanded the center for artillery instruction between 1940 and 1941.
He was chief of the general staff of the Odessa command from October 16 to 22, 1941.
He was killed during the Battle of Stalingrad, when his 15th Infantry Division was overrun and wiped out during the Soviet Operation Uranus.
He was the only Romanian division commander killed in action during WWII.After his death, he was made a brigadier general, retroactive to October 22, 1941.