Nicholas Mario Grigsby (born July 2, 1992) is a former American football linebacker.
Grigsby was signed by the Los Angeles Rams as an undrafted free agent in 2016.
He was also a member of the Baltimore Ravens, New England Patriots, Detroit Lions, Green Bay Packers, St. Louis Battlehawks and Ottawa Redblacks.
After going undrafted in the 2016 NFL draft, Grigsby signed with the Los Angeles Rams on May 4, 2016.
On August 25, 2019, Grigsby was claimed off waivers by the Green Bay Packers, but was waived the next day after failing his physical.