|Type||Competed in Olympic Games|
|Born||25 December 1914 in ?, Shizuoka (JPN)|
|Affiliations||Shizuoka Technical High School, Shizuoka (JPN)|
Iwao Masuda won the 400 metre title at the 1932 Japan Athletics Championships in 50 seconds flat, which earned him a place on the Japanese Olympic team, where he advanced only to round two. In the 4x400 metre relay, the Japanese team, including Masuda, placed fifth in the final.
Personal Best: 400 – 50.0 (1932).
|1932 Summer Olympics||Athletics||400 metres, Men||Olympic||6 h1 r2/4||Representing Japan|
|4 × 400 metres Relay, Men||Olympic||Japan||5|