Arthur Napoleão dos Santos (6 March 1843 – 12 May 1925) was a Portuguese composer, pianist, instrument dealer and music publisher.

Thereafter he toured all over Europe and America, sometimes playing duets with Henri Vieuxtemps or Henryk Wieniawski.

At age 15, he performed in New York and critic Richard Storrs Willis attended "out of curiosity to see the sort of child that tickles Europe".

Willis was impressed and noted him as "an extraordinary performer... His touch is exquisitely full of tenderness; his precision almost unerring; his power more than respectable, and his rounding of musical thought perfectly delightful.

He wrote incidental music for O remorso vivo by Furtado Coelho and Joaquim Serra (first staged Feb 21, 1867).