Arthur Claassen, Sr. (February 19, 1859 - March 16, 1920) was an orchestral conductor.

He attended the music school in Weimar, Germany.

From 1880 to 1884 he worked as an opera conductor in Göttingen and Magdeburg.

Claassen moved to San Francisco, California, in 1919.

[1] He was buried in Mission Burial Park South in San Antonio, Texas.