"XIX" is a promotional single by American heavy metal band Slipknot and the opening track for their fifth major label studio album .5: The Gray Chapter.

The song was first released as a digital single on October 14, 2014 on the same day as its subsequent track "Sarcastrophe".

The song was uploaded to their official YouTube channel with a few days leading up to the release of .5: The Gray Chapter.

An official music video was released for the song on October 5, 2015.

Metal Injection described the song as "Slipknot's most emo track off .5: The Gray Chapter.