"Don't Take It Personal (Just One of Dem Days)" is a song by American recording artist Monica. It was written by producer Dallas Austin, Willie James Baker, Derek Simmons, Carlton Ridenhour, Quincy Jones III, Abrim Tilmon, Hank Shocklee, Eric Sadler and LL Cool J. while production was helmed by the former. It contains samples of LL Cool J's 1993 song "Back Seat (Of My Jeep)" and Public Enemy's 1987 song "Bring the Noise," and also features elements from "You're Gettin' a Little Too Smart" by The Detroit Emeralds, as sampled by "Back Seat (Of My Jeep)".

The song was released as the album's lead single in the United States in early 1995. It sold 1.2 million copies domestically and earned a platinum certification from the RIAA. It spent two weeks at number-one on the U.S. Billboard Hot R&B Songs chart, and peaked at number two on the Billboard Hot 100, also reaching the top ten of the singles charts in Australia and New Zealand. "Don't Take It Personal (Just One of Dem Days)," alongside follow-up single "Before You Walk Out of My Life," would make the singer the youngest recording artist to have two consecutive number-one hits on the Billboard R&B chart at the age of fourteen.

An accompanying music video for the single, shot in black-and-white, was directed by Rich Murray and released in June 1995.

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