Seiji Uebayashi is a professional Japanese baseball outfielder for the Chunichi Dragons. He was drafted and played primarily for the Fukuoka SoftBank Hawks of Nippon Professional Baseball (NPB).

The Chunichi Dragons are a professional baseball team based in Nagoya, the chief city in the Chūbu region of Japan. The team plays in the Central League of Nippon Professional Baseball. They have won the Central League pennant nine times and the Japan Series twice. They were also champions in the 2007 Asia Series.