Toyoji Aihara (相原 豊次, Aihara Toyoji, born 7 January 1914, date of death unknown) was a Japanese sprinter at the 1936 Summer Olympics.
Aihara competed at the Olympics at the same time he was attending Chuo University in Tokyo.
[1] Aihara competed in the men's 400 metres and the men's 4 x 400 metres relay events at the 1936 Summer Olympics.
[2] He competed in the Hakone Ekiden relay race in 1937 and won the 400 metre and the 400 metre hurdles events at the 1937 Japan Athletics Championships.
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