Jon Andreas Nödtveidt (June 28, 1974 – August 16, 2006) was a lead guitarist and vocalist of the Swedish death metal/black metal band Dissection, which he founded in 1989.

Nödtveidt also performed in several other projects, including Necrophobic, The Black (as Rietas), De Infernali, Nifelheim, Ophthalamia (as Shadow), Satanized, Siren's Yell, Terror (a grindcore band which featured members of At the Gates).

He also appeared as a journalist in Metal Zone where he was responsible for keeping track of the growing black metal-scene.

He was an initiate of the MLO (Misanthropic Luciferian Order).

Nödtveidt was convicted of felony murder of a 38-year-old homosexual Algerian Josef Ben Meddour in 1997. He was released from prison in 2004 and restarted Dissection.

On the 16th of August 2006, he was found dead in his apartment in Hässelby, a suburb of Stockholm by an apparent self-inflicted gunshot wound inside a circle of lit candles. Dissection's official website later confirmed his death.

Early reports indicated that he was found with an open copy of the Satanic Bible, but these were later dismissed by Dissection's guitarist Set Teitan. According to him, "it's not any atheist, humanist and ego-worshiping 'Satanic Bible' by Anton LaVey that Jon had in front of him, but a Satanic Grimoire. He despised LaVey and 'Church of Satan'."

The said "Satanic Grimoire" is reputed to be the Liber Azerate, one of the publishings of the Misanthropic Luciferian Order, from which Jon Nödtveidt apparently was influenced, his last album Reinkaos's lyrics being co-written by the very same man who wrote the Liber Azerate.