"Thank God I Found You" is a song by American singer and songwriter Mariah Carey. It features guest vocals from R&B singer Joe and American boy band 98 Degrees. Written and produced by Carey along with Jimmy Jam and Terry Lewis, the song was released on January 25, 2000, through Columbia Records as the second single from her seventh studio album, Rainbow (1999). "Thank God I Found You" is an R&B power ballad that was inspired by a relationship Carey was going through at the time, and lyrically recounts a powerful love relationship in which the protagonist tells her lover "thank God I found you."

"Thank God I Found You" received mixed reviews from contemporary music critics; some felt it was a great album closer while others deemed it as "un-listenable" and "forgettable". Nevertheless, the song became Carey's fifteenth number-one single on the United States Billboard Hot 100 and remained her last chart topping single until 2005's comeback single "We Belong Together". The single was later certified Gold by the Recording Industry Association of America (RIAA). Aside from its peak of number two in Canada, the song achieved moderate international charting, reaching the top ten in the United Kingdom and peaking within the top thirty in Australia, Belgium (Wallonia), France, Germany, the Netherlands, and Switzerland.

A music video for "Thank God I Found You", directed by Brett Ratner, features Carey, Joe, and 98 Degrees performing the song at an outdoor concert. The Make It Last Remix had its own video commissioned, which was shot in a grainy fashion in Hamburg, Germany, and shows Carey and the song's featured artists performing at a small club. Carey performed the song's original version and accompanying remix live at the 27th Annual American Music Awards. It was featured on the set-lists of the Rainbow World Tour (2000) and The Adventures of Mimi Tour (2006), with Trey Lorenz serving as the male vocalist.

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