"Leader of the Pack" is a song written by George "Shadow" Morton, Jeff Barry, and Ellie Greenwich. It was a number one pop hit in 1964 for the American girl group The Shangri-Las. The single is one of the group's best known songs as well as a popular cultural example of a "teenage tragedy song". The song was covered in 1985 by the heavy metal band Twisted Sister who had a moderate hit with their version.

The tune of "Leader of the Pack" is credited to pop impresario George "Shadow" Morton together with Jeff Barry and Ellie Greenwich. According to Morton, he wrote the song for the Goodies (also known as the Bunnies), but instead it was needed as a follow-up to the Shangri-Las hit "Remember (Walking in the Sand)". He said he did not know that he was supposed to have a second idea ready to follow up "Remember (Walking in the Sand)" until Jerry Leiber and Mike Stoller (Red Bird Records co-owners with George Goldner) asked him, "Hey, what do you want to do for the second record?" Morton said he "got a bottle of champagne, two cigars" and "went into the shower, sat down, drank the champagne, smoked the cigars, and wrote the song on a shirt cardboard with my kids crayons." Morton claimed he credited Barry and Greenwich as co-writers for business reasons; however his recollection has been questioned by Ellie Greenwich.

The song is about a girl named Betty, who is asked by friends to confirm that she is dating Jimmy, the leader of a motorcycle gang, whose ring they see on Betty's finger. After singing of love at first sight ("(By the way, where'd you meet him?) I met him at the candy store/He turned around and smiled at me/You get the picture?/(Yes, we see) That's when I fell for the Leader of the Pack"), Betty's heart turns to despair as she bemoans her parents' disapproval. The parents claim Jimmy hails from "the wrong side of town" and ask Betty to tell Jimmy goodbye and find someone new. Betty reluctantly does as she is asked, and a crushed and tearful Jimmy speeds off on his motorcycle. Moments later, Jimmy crashes on a rain-slicked surface and dies; Betty's pleas for Jimmy to slow down are in vain.

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