"Rainy Dayz" is a song by American recording artist Mary J. Blige featuring additional vocals by rapper Ja Rule. Taken from Blige's re-release of her fifth studio album, No More Drama, the track was released to coincide with the release of the album's reissue, serving as its final single. The Irv Gotti-produced duet became another hit for both, while peaking at number 12 on the Billboard Hot 100 and number 17 in the United Kingdom.

The track was originally written for TLC but the group turned the track down. References to TLC being the group in mind when the track was written can be heard in the lyrics "We’re always livin’ so crazy and sexy and cool" (in reference to their album CrazySexyCool) and "Baby didn’t we tell you before about chasin’ those waterfalls" (in reference to their 1995 single "Waterfalls"). The track also has a reference to the Marvin Gaye song "What's Going On."

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