Niels Simonsen (10 December 1807 in Copenhagen – 11 December 1885 in Frederiksberg) was a Danish artist, best known for his battle paintings.
His parents were shopkeepers. At the age of fourteen, he was apprenticed to a master decorative painter and began to take drawing lessons at the Royal Danish Academy of Fine Arts. Later, he took private lessons from J.L. Lund.
He had originally planned to make lithography his career but, after a successful showing at the Charlottenborg Spring Exhibition in 1827, he turned to sculpture and received some orders, including one for reliefs in a hall at Christiansborg. In 1830, he was awarded a small gold medal for his relief of Christ healing the sick, which is now displayed in Kongens Nytorv.
Although the fees for these commissions were substantial, portrait busts were his primary source of income. His failure to win any more official recognition for his work soon prompted him to turn to painting. He held his first exhibition in 1833, after some very brief training. His painting of a wounded soldier brought him some prize money and was quickly purchased. It was later widely reproduced; notably in an engraving by Carl Edvard Sonne.
By 1834, having failed to reproduce this initial success, he requested a loan from Privy Councilor Nicolai Holten (1775-1850), who had recently bought an altarpiece he had been unable to sell after those who ordered it changed their minds. The loan was given and it enabled him to spend two years in Munich, where he came under the influence of the Academy of Fine Arts and developed friendships with the artists there.
He soon found buyers for his work; landowners and businessmen as well as foreign art collectors. By 1837, he was sufficiently well-off to send home for his fiancée and get married. Over the next few years, he travelled to Tyrol, Northern Italy and Algiers. The resulting works were purchased by the royal families of Bavaria and Württemberg and the Royal Collection in Copenhagen.