Christian Horneman was a Danish miniature and pastels painter, mainly known for portraits. He was the father of the composer Emil Horneman and grandfather of C. F. E. Horneman, also a composer.
Horneman was born on 15 August 1765 in Copenhagen. He attended the Royal Danish Academy of Fine Arts from 1780, winning its small silver medal in 1785, and its large silver medal in 1786. In 1787 he went abroad to further his studies and it would take sixteen years before he returned to Denmark. He specialized in portrait miniatures. He experienced the outbreak of the French Revolution first hand in Paris in 1789. He also visited Italy and Vienna, where Johann Heinrich Wilhelm Tischbein and Heinrich Füger were among the artists who inspired him. In Berlin he learned a new technique, most likely from Daniel Chodowiecki, which he often used in his later work.
In 1803 Horneman returned to Denmark and the following year he was appointed miniature painter to the Royal Danish County. In 1805 he became a member of the Academy and in 1816 he was given free residency at Charlottenborg. He was made a professor in 1835.
In his later years he suffered from poor health and from 1840 he received an annual pension. He is buried at the Garnisons Cemetery in Copenhagen.