"Girl's Best Friend" is a 1999 single by rapper Jay-Z that features vocals from Mashonda. It was released on August 9, 1999, as a single to promote the comedy film Blue Streak and appears on its soundtrack Blue Streak: The Album. In the same year, it appeared as a hidden track on Jay-Z's fourth album Vol. 3... Life and Times of S. Carter. Its beat, produced by Swizz Beatz, contains a sample of "Keep It Comin' Love" by KC and the Sunshine Band.

"Girl's Best Friend"
Single by Jay-Z
from the album Blue Streak: The Album and Vol. 3... Life and Times of S. Carter
Released	August 9, 1999
Genre	East Coast hip hop
Length	4:00
Label	Epic Sony Music Soundtrax
Songwriter(s)	Shawn Carter Kasseem Dean
Producer(s)	Swizz Beatz
Jay-Z singles chronology
"Jigga My Nigga" (1999) "Girl's Best Friend" (1999) "Do It Again (Put Ya Hands Up)" (1999)
Mashonda singles chronology
"Gotta Man" (1998) "Girl's Best Friend" (1999)

Martin Lawrence, the star of Blue Streak, makes a cameo in the music video (directed by Francis Lawrence) as his character's "Pizza Man" disguise, dancing to the song and making silly faces in the camera.