Z is the fourth studio album by psychedelic rock band My Morning Jacket. This collection features a much spacier and more polished sound than previous releases, making heavy use of synthesizers throughout and incorporating reggae and dub influences. The heavy reverb that was a defining characteristic of the band's prior recordings is largely absent. The songs on the album are more focused and shorter compared to the band's previous albums.

A double-live album, Okonokos, was recorded at the end of the Z Tour and was released on September 26, 2006; it features live versions of eight of Z's 10 songs.

In 2012, Rolling Stone ranked the album at number 457 on its list of The 500 Greatest Albums of All Time. The magazine has also ranked the album 31st on its list of the 100 best albums of the 2000s and 23rd of the 40 greatest stoner albums ever.