Justin D. Ross (born April 18, 1976) is an American politician who served in the Maryland House of Delegates from 2003 to 2012. He was first elected to the House in 2002 to represent District 22, which covers Prince George's County.

Ross retired from the House of Delegates in November 2012. Ross served as a top lieutenant to Maryland House Speaker Michael E. Busch. In his roles as Chief Deputy Majority Whip from 2006-20012, Ross is widely credited in delivering the last minute votes needed to pass marriage equality in February 2012. Later that September during a rare special session of the Maryland Legislature, Ross again was able to help secure the votes for legislation that allowed for MGM National Harbor to open in Prince George's County. He was given the nickname "Mr. 71" (the number of votes needed to pass a bill) by then Speaker Michael Busch for his ability to secure the votes in the Maryland House of Delegates.

On July 1, 2013, Justin joined with Timothy A. Perry, Josh White and Jonas A. Jacobson to form the Annapolis government relations firm of Perry, White Ross & Jacobson www.pwrjmaryland.com. PWRJ quickly became among the very elite of government relations firms in Maryland. On July 1, 2021, Ross left PWRJ and began a new role as Senior Vice President for Global Programming for Next Level Sports & Entertainment (NLSE). NLSE is the only Black-owned sports network in the world is available in approximately 30 Million US Homes on providers such as Verizon Fios, Direct TV, AT&T, Fubo, & Distro.