"Not Today" is a song by American R&B singer Mary J. Blige, featuring guest vocals by rapper Eve. It was written by Blige, Eve, Mike Elizondo, Theron Feemster, Bruce Miller, and Dr. Dre for Blige's sixth studio album Love & Life (2003), while production was helmed by the latter. Built upon a "plinking beat," "Not Today" emphasizes the theme of broken promises and has Blige singing about how her partner told her promises every day, but never followed through, prompting her to walk away from the relationship.

Mary Jane Blige is an American singer, songwriter, rapper, and actress. Often referred to as the "Queen of Hip-Hop Soul" and "Queen of R&B", Blige has won nine Grammy Awards, a Primetime Emmy Award, four American Music Awards, twelve NAACP Image Awards, and twelve Billboard Music Awards, including the Billboard Icon Award. She has been nominated for three Golden Globe Awards and two Academy Awards, including one for her supporting role in the film Mudbound (2017) and another for its original song "Mighty River", becoming the first person nominated for acting and songwriting in the same year.