Seneca Lassiter (born 12 March 1977) is an American former middle distance runner who specialized in the 1500 meters.
As a high schooler running for Lafayette of Williamsburg, Virginia, he won National Scholastic indoor and outdoor championships for the mile and 800 meter run.
In collegiate competition he ran for University of Arkansas, which was recognized for its prestigious track program which in Lassiter's time included recruits such as Sharif Karie.
Lassiter ran professionally for Nike after his college spell.