R. J. Mattes (born April 29, 1990) is an American football offensive lineman that played for the New England Patriots and Tampa Bay Bucs.

He played college football at North Carolina State.

On May 13, 2013, Mattes signed with the New England Patriots as an undrafted free agent.

[2] On August 20, 2013, he cleared waivers and was placed on the Patriots' injured reserve list.

Mattes was signed by the New England Patriots as a free agent on December 30, 2013 [3] He was waived on June 11, 2014.