"Rap Devil" is a diss track performed by American rapper Machine Gun Kelly.

"Rap Devil" peaked at number 13 on the Billboard Hot 100 singles chart in the United States.

"[2] In a 2018 interview, Machine Gun Kelly said he did not know how old Hailie was and had reacted after seeing a headline about her saying she was all grown up.

[4] In an interview, when asked if he thought the song was a good diss track by Machine Gun Kelly, Eminem stated "it's not bad... for him".

A music video for the song was released on WorldStarHipHop's YouTube channel and website on September 3, 2018.