Marcel Olteanu (May 4, 1872 – 1943) was a Romanian brigadier general during World War I and the Hungarian–Romanian War. He was born in Craiova, a descendant of Petru Maior. His sister, Adelina, later married Octavian Codru Tăslăuanu. In 1889 he went to Bucharest, where he enlisted in the Military School of Infantry and Cavalry, graduating in 1891 with the rank of second lieutenant, after which he advanced to lieutenant (1894), captain (1900), and major (1910). Also in 1910, Olteanu was awarded the Order of the Crown, Officer rank. He completed his studies at the Higher War School in Bucharest. Olteanu served in the Second Balkan War in 1913, and was decorated with the . He was promoted to lieutenant colonel in April 1914 and colonel in May 1916. Starting in October 1912, Olteanu was the in