"So Gone" is a song by American R&B recording artist Monica. It was one out of several tracks rapper-producer Missy Elliott wrote and produced along with Kenneth Cunningham and Jamahl Rye from production duo Spike & Jamahl for Monica's fourth studio album, After the Storm (2003), following the delay and subsequent reconstruction of her 2002 album, All Eyez on Me. Incorporating elements of hip hop and 1970s-style quiet storm as well as soul music, it features a sample from the 1976 song "You Are Number One", penned by Zyah Ahmonuel and performed by The Whispers.

Following the less successful chart performances of previous singles "All Eyez on Me" and "Too Hood", J Records released the song on April 8, 2003 as the lead single from After the Storm in the United States. The song was lauded by critics, who praised its vintage touches and sparse hip hop–influences. "So Gone" became Monica's biggest commercial success in years, reaching number 10 on the US Billboard Hot 100 and the top of both the Hot R&B/Hip-Hop Singles & Tracks and Hot Dance Club Play charts, becoming her first chart topper since 1998's "The First Night".

The song's music video, directed by Chris Robinson and shot at Miami's South Beach in April 2003, features Monica as one half of a dysfunctional relationship in which she prejudges her man to cheat on her. It ends on a cliffhanger, which leads to the video for the album's second single, "Knock Knock". Nominated for a Soul Train Music Award for Best R&B/Soul Single, Monica performed the song on several televised events, including 106 & Park, The Today Show, The Tonight Show with Jay Leno and MTV's Total Request Live.

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