Otto Ernest Passman (* June 27, 1900 in Franklinton, Washington Parish, Louisiana; † August 13, 1988 in Monroe, Louisiana ) was an American politician (Democratic Party), who represented Louisiana in the U.S. House of Representatives.
Passman was born on a farm near Franklinton, Louisiana. He graduated from High School in Baton Rouge and at the Soule Business College in Bogalusa. Passman was in 1929 employed by a manufacturer of commercial refrigerators and worked as a distributor of hotel and catering equipment articles in Monroe. He was also the owner of Passman Investment Company. During the Second World War, he was promoted to Lieutenant in the United States Navy and served on 11 October 1942 until his release on 5 September 1944 at the rank of Lieutenant Commander. He then took up his activities in his trading company again.
He was also in the years 1948, 1952 and 1956, a delegate to the Democratic National Convention. He also was elected to the 80th and the 14 subsequent Congresses, where he worked from 3 January 1947 to 3 January 1977. He ran again in 1976 unsuccessfully for the 95th U.S. Congress. During his tenure in Congress, he participated at the 1956 Constitution of the Southern Manifesto, which spoke out against racial integration in public institutions. He lived in Monroe, where he also died on 13 August 1988.