"Flex (Ooh, Ooh, Ooh)" is a song by American rapper Rich Homie Quan. It was released on February 10, 2015, as a single from his mixtape If You Ever Think I Will Stop Goin' in Ask RR (Royal Rich) (2015). It was produced by DJ Spinz and Nitti Beatz.

The song has peaked at number 26 on the US Billboard Hot 100. To date, this is Rich Homie Quan's highest charting single as a solo artist. As of August 2015, "Flex (Ooh, Ooh, Ooh)" has sold 425,000 copies domestically. In October, the single was certified platinum and reached #1 on Urban Radio.

A music video for "Flex (Ooh, Ooh, Ooh)" was released on April 1, 2015. It was directed by Be El Be. The video is notable for its high levels of stunting and also serves as the preeminent example of "hitting the Quan."

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