Otto Neumann Knoph Sverdrup (31 October 1854, in Bindal, Helgeland – 26 November 1930) was a Norwegian sailor and Arctic explorer.
He was born in Bindal as a son of farmer Ulrik Frederik Suhm Sverdrup (1833–1914) and his wife Petra Neumann Knoph (1831–1885). He was a great-grandnephew of Georg Sverdrup and Jacob Liv Borch Sverdrup, first cousin twice removed of Harald Ulrik and Johan Sverdrup, second cousin once removed of Jakob, Georg and Edvard Sverdrup, third cousin of Georg Johan, Jakob, Mimi, Leif and Harald Ulrik Sverdrup. He was a brother-in-law of Johan Vaaler, and Otto himself married his own first cousin, Gretha Andrea Engelschiøn (1866–1937), in October 1891 in Kristiania. Their daughter Audhild Sverdrup (1893–1932) married Carl Johan Sverdrup Marstrander.
His father was born on Buøy in Kolvereid municipality. As oldest son Otto was heir to the Sverdrup properties at Buøy. However, he left it all to his younger brothers and went to Åbygda in Bindal, to the farm named Hårstad, where Otto Sverdrup was born. In 1872, at the age of 17, Otto Sverdrup returned to Nærøy, to Ottersøy where his uncle Søren worked in transportation with his own vessels. Here Sverdrup started his career as a seaman and after a while he was sailing abroad. In 1875 he passed his mate's examination, and some years later the shipmaster's examination.