"I Decided" is a song by American recording artist Solange Knowles. It was written and composed by Knowles and producer Pharrell Williams for her second studio album Sol-Angel and the Hadley St. Dreams (2008). The song samples hand-claps of the 1964 recording "Where Did Our Love Go", as performed by The Supremes, and is also based on the melody of "(Love Is Like a) Heat Wave" by Martha and the Vandellas. It was released as the album's leading single as a digital download to both iTunes and Amazon on April 22, 2008 (see 2008 in music), and was impacted to rhythmic/crossover radio stations on June 24, 2008.

A remix version of the song, entitled "I Decided (Part 2)", produced by British band Freemasons was released as the first single in Europe, where the song entered the top 30 of the UK Singles Chart. The track reached the number-one spot on the US Billboard Hot Singles Sales, Hot R&B/Hip-Hop Singles Sales, Hot Dance Singles Sales and Hot Dance Club Play charts.

The video was shot in April 2008 and directed by Melina Matsoukas and Solange as it shows pop culture imagery from the 1960s, shows the 1970s, then 1980s to the future. It displays Solange in settings from American Bandstand, to the Civil Rights Movement, to Soul Train, to MTV, and finally a "Cosmic Journey" future. It is set in a pop art form. As of December 5, 2015, on YouTube the original version has been watched more than 1,630,000 times. The shortened video for "I Decided, Pt. 2" has been watched more than 423,000 times.

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