The Pittsburgh Steelers signed Mark Barron prior to the 2019 season thinking he would be a cure-all for their needs at linebacker/safety. After the failed acquisition of Morgan Burnett in 2018, Barron seemed to be the perfect fit for the hybrid player the Steelers wanted to deploy in the secondary.
In 2019, Barron started nine games for the Steelers and appeared in 15. His 750 defensive snaps was 9th on the Steelers defense and his 82 combined tackles was fourth behind Devin Bush, Terrell Edmunds, and Cameron Heyward.