Seiji Komatsu

|height=176 cm |weight=82 kg |residence=Matsuyama, Japan |sport=Canoe sprint |club=Ehime Prefecture National Sporting Performance Office | medaltemplates = }}

}} is a Japanese sprint canoeist. Competing in the individual 200 m event he won a silver medal at the 2017 Asian Championships and a bronze at the 2014 Asian Games.

Komatsu took up canoeing aged 13 in Miyagi Prefecture. Besides training himself, he coaches high school students, and works for the Ehime Prefecture National Sporting Performance. In 2017 he was banned from competitions for doping, but the ban was lifted next year when it was found that his rival Yasuhiro Suzuki intentionally added an anabolic steroid into Komatsu's drink. Provided by Wikipedia