The Smile Sessions is a compilation album and box set recorded by American rock band the Beach Boys, released on October 31, 2011, by Capitol Records. The set is the follow-up to The Pet Sounds Sessions (1997), this time focusing on the abandoned recordings from the band's unfinished 1966–1967 album Smile. It features comprehensive session highlights and outtakes, with the first 19 tracks comprising a hypothetical version of the completed Smile album.

The compilation is the first and only package devoted to the 1960s Smile recordings originally produced by Brian Wilson, arriving after decades of public anticipation and numerous false starts. The project was led primarily by audio engineers Alan Boyd, Mark Linett, and Capitol A&R director Dennis Wolfe, with Wilson acting as a remote supervisor, assisting the engineers with some mixing decisions. Previously, Wilson had completed a solo album based on Smile in 2004, which Boyd, Linett, and Wolfe used as a blueprint for The Smile Sessions. Wilson later stated that, while the compilation is "not a far cry" from his original vision, he prefers his 2004 version.

The Smile Sessions received virtually unanimous critical acclaim upon release. It was ranked number 381 in Rolling Stone's 2012 list of the greatest albums of all time and won the Grammy Award for Best Historical Album at the 2013 Grammy Awards. A spiritual successor, 1967 – Sunshine Tomorrow, followed in 2017.