"Sister Jack" is a single from indie rock band Spoon. It was released in 2005, and is found on their album Gimme Fiction. A piano demo of the title track can be found on the bonus disc included with limited editions of Gimme Fiction. "Sister Jack" was also featured on the Wedding Crashers soundtrack.

From "Sister Jack", the lyrics "I was in this drop-D metal band we called Requiem" refers to Joshua Zarbo's first band, Requiem. Zarbo was the bassist for Spoon up until Ga Ga Ga Ga Ga.