Justin Renfrow (born November 23, 1989) is a Canadian football offensive tackle for the Calgary Stampeders of the Canadian Football League (CFL). He has previously played for the Florida Blacktips and Hudson Valley Fort of the Fall Experimental Football League (FXFL).
Renfrow went undrafted in 2014. He and 11 other Cardinals players were released on August 25, 2014.
Green Bay Packers
Renfrow signed a contract with the Green Bay Packers but was released on December 29, 2014.
San Francisco 49ers
Renfrow signed a contract with San Francisco 49ers on May 18, 2015 along with Michigan State's Mylan Hicks.  He was released on September 5, 2015 in order for the 49ers to make their 53-man roster. 
On June 17, 2016, Renfrow signed with the Buffalo Bills.