Johan Thomas Lundbye (1 September 1818 – 25 April 1848) was a Danish painter and graphic artist, known for his animal and landscape paintings.

He was inspired by Niels Laurits Høyen's call to develop nationalistic art through depictions of Denmark's characteristic landscapes; the historical buildings and monuments, and the country's simple, rural people.

He studied privately under animal painter Christian Holm (1804–1846) and at the age of 14 he came into the drawing school of Johan Ludwig Lund (1777–1867).

He began exhibiting in 1835, and in 1839 he made En gravhøj fra oldtiden ved Raklev på Refsnæs (An Ancient Burial Mound by Raklev on Refsnæs (1839) and his painting Parti af Dyrehaven med Hjorte og Hinde (View of the Deer Park with Stag and Hind) was purchased by Kunstforeningen, the influential art society associated with art historian and critic Niels Laurits Høyen (1798–1870).

He illustrated Fabler for Børn: Et halvhundrede Billeder by poet Hans Vilhelm Kaalund (1818–1885), a book of poetry for young children published in 1845.