20 Years of Jethro Tull

20 Years of Jethro Tull is a 1988 boxed set which spans the first twenty years of Jethro Tull. It was issued as five LPs: Radio Archives, Rare Tracks, Flawed Gems, Other Sides of Tull, and The Essential Tull. It was simultaneously released as both a three CD and a three cassette set, titled 20 Years of Jethro Tull: The Definitive Collection.
All three versions were housed in a 12"x12" cardboard box, with a 24-page booklet; the CD and cassette versions having a black plastic tray.
A single CD sampler and a double LP album were also created, titled 20 Years of Jethro Tull: Highlights.