"Before You Walk out of My Life" is a song by American R&B singer Monica. It was written by Andrea Martin and Soulshock & Karlin, and it was produced by Soulshock & Karlin for Toni Braxton's album Secrets but ended up on Monica's debut studio album, Miss Thang (1995). The song was released as the album's second single on August 3, 1995, with "Like This and Like That" serving as its double A-side stateside.

The single became Monica's second number-one hit on the Billboard Hot R&B/Hip-Hop Songs chart, spending two weeks at number-one on the chart, and reached number seven on the Billboard Hot 100 and number eight on the New Zealand Singles Chart. Additionally, the song was ranked number thirty-eight on the 1996 Billboard year-end chart and certified platinum by the RIAA. "Before You Walk Out of My Life," alongside previous single "Don't Take It Personal (Just One of Dem Days)," made the singer the youngest recording artist to have two consecutive number-one hits on Billboard's R&B chart at the age of fourteen.

An accompanying music video for the single was directed by Kevin Bray and released in August 1995.

These are the formats and track listings of major single-releases of "Before You Walk Out of My Life".

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