Calvin Smith Jr. (born December 10, 1987) is an American athlete who specializes in the 200m and 400m.

He is the son of former world record-holder, world champion, Olympic medalist and National Track & Field Hall of Famer, Calvin Smith Sr. Smith is an All-American for University of Florida.

He has earned 18 All-America titles, the most in University of Florida track and field history.

Smith was also a part of the 2010 NCAA indoor national championship team and was an alternate in the 2008 Beijing Olympic Games on the United States 4x400 relay although he did not compete.

[1][2][3] He won gold medals in the relay at three consecutive World Indoor Championships starting in 2012.