Otto August Rosenberger (10 August 1800 - 23 January 1890) was a Baltic German astronomer from Tukums in Courland.
He was born in Tukkum, Courland, Russia. Rosenberger graduated from the University of Königsberg, and was noted for his study of comets. He won the Gold Medal of the Royal Astronomical Society in 1837. He died in Halle, Prussian Saxony.
The crater Rosenberger on the Moon is named after him.