Mick Barr is an American avant-garde metal guitarist. Notable for his relentless speed and agility on his instrument, he is most well known for being one half of the band Orthrelm, currently signed to Mike Patton's Ipecac Recordings label.

Some of Barr's other projects have included Crom-tech, and a duo with drummer Zach Hill from Hella, as well as appearances with Quix*o*tic, and The Flying Luttenbachers. He has also released albums under the names Ocrilim and Octis, consisting of his own guitar over a drum machine. On the difference between the two, he says "Ocrilim is Mick Barr overthinking. Octis is Mick Barr underthinking. These names mean nothing when a live show is concerned. Come see Ocrilim and you may be forced to watch Octis."