Ottmar Mergenthaler (May 10, 1854 - October 28, 1899) was a German inventor.
He was born in Hachtel, Württemberg, Germany, the third son of a school teacher and apprenticed to a watchmaker before moving to Baltimore, Maryland, USA in 1872. He invented the linotype in 1886, a machine that allowed an operator to automatically set type, which revolutionized the printing industry. He died of tuberculosis in Baltimore in 1899.
A building is named after him at Johns Hopkins University.
