- Made his stage debut at the age of seventeen with his father's company. In his fifty years on the stage, he played more than three hundred characters in over ten thousand performances.
- In 1938, a founding member of Actors' Equity Association, he was elected president of that organization.
- American Film Institute Catalog of Feature Films 1931-1940 is under the impression, in their index, that Arthur Byron and Arthur S. Byron are the same person. They are not.
- Father: Oliver Doud Byron; Mother: Mary Kate Rehan (née Crehan), aka actress Kate Byron (1846-1920).
- Probably should be nicknamed "Official" (Arthur "Official" Byron), to distinguish him from the unrelated actor nicknamed "Pop" (see on IMDB under A. S. "Pop" Byron). In his film career this Arthur "Official" Byron often played roles of government officials, professors, doctors, and other respectable gentlemen.
- Son of actor Oliver Doud Byron.
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