Arne Lofthus (23 September 1881 – 16 May 1962) was a Norwegian painter who settled in Denmark.

In 1901 Arne Lofthus joined Joakim Skovgaard and became one of his co-workers at the fresco decoration of Viborg Cathedral.

[3] Lofthus painted landscapes, still lifes, floral motifs and portraits, often in subdued colors.

[4] Among his paintings are the frescos Pike som grer håret (1915), Else blåser såpebobler (1916), Oksestek (1924) and Blomkål og epler, all in the National Gallery of Norway.

His portraits include oceanographer Bjørn Helland-Hansen, poet Nordahl Grieg as well as painters Karl Madsen and Joakim Skovgaard.