Oluseyi Smith or Seyi Smith (born February 21, 1987) is a Nigerian-born Canadian sprinter. He took part in the 2012 Summer Olympics in the 4 × 100 m relay with teammates Jared Connaughton, Gavin Smellie and Justyn Warner. In the final, the Canadian relay team arrived in third place and initially believed they had won bronze but they were disqualified when officials judged that Connaughton had stepped on the lane line just before passing the baton. The relay team from Trinidad and Tobago were awarded the bronze.