Atavachron is the fourth studio album by guitarist Allan Holdsworth, released in 1986 through Enigma Records (United States) and JMS–Cream Records (Europe). The album's title and seventh track, as well as the cover art, are references to the "Atavachron" alien time travel device from the Star Trek episode "All Our Yesterdays". This marks Holdsworth's first recorded use of the SynthAxe, an instrument which would be featured prominently on many of his future albums.
John W. Patterson of AllMusic gave Atavachron four stars out of five, describing it as "semi-progressive" with a "symphonic element" and praising it as "clear evidence of the genius Holdsworth was demonstrating release after release". He also highlighted the use of the SynthAxe, as well as praising the "beautiful female vocals" of Rowanne Mark, who makes her first of two appearances on a Holdsworth album; the other being Secrets (1989).