Arnold Krog (18 March 1856 - 7 June 1931) was a Danish architect, painter and designer who is remembered for his achievements as artistic director of Royal Copenhagen from 1884 to 1916.

He enrolled at the Royal Danish Academy of Fine Arts' School of Architecture in October 1874, graduating in 1880.

He also worked as a draftsman for Ludvig Fenger and contributed to Ferdinand Meldahl and Heinrich Hansen's interior restoration of Frederiksborg Castle and received attention for his Moorish Hall at the Panopticon Building in Copenhagen.

After Aluminia's acquisition of the Royal Copenhagen Porcelain Manufactury in 1882, its director, Philip Schou (1838-1922), was looking for someone who could revive the stagnating company artistically.

In 1884 he asked the xylographer Frederik Hendriksen for advice on the matter and he proposed Krog as a possible candidate for the job.