- Arthur Reginald Marsden Lower
- Arthur Romano
- Arthur Roy Brown
- Arthur Scammell
- Arthur Semple
- Arthur Shilling
- Arthur Siegel
- Arthur Stanley Lamb
- Arthur Sturgis Hardy
- Arthur Sutherland Piggott Woodhouse
- Arthur T. Doyle
- Arthur Thomas Bushby
- Arthur Thomas Howe
- Arthur Watkins Crisp
- Arthur Wellesley Hughes
- Arthur William Delamont
- Artificial Heart Developed
- Artificial Intelligence (AI) in Canada
- Artificial Mini-Hearts Developed
- Artiodactyla
