"The Rocker" is a song by Irish rock group Thin Lizzy, included on their 1973 album Vagabonds of the Western World.

It was also released as a single in a 2:41 edited format; the original album track stretched to 5:17, with most of the extra length being taken up by an extended guitar solo by Eric Bell.

There is an accompanying performance on Dutch TV programme TopPop to the song which features Gary Moore recorded in 1974 during his first of two spells with the band.

This track later appeared on the four-CD box set Vagabonds Kings Warriors Angels as "Cruising in the Lizzy Mobile".

[5] However, it became a live favourite and was one of the few songs from Eric Bell's time with the band to survive his departure and become part of the live repertoire of the Brian Robertson/Scott Gorham lineup (who performed the song in a lower key than the original).