Phrack is an e-zine written by and for hackers, first published on November 17, 1985. It has a wide circulation which includes both hackers and computer security professionals.

Originally covering subjects related to phreaking, anarchy, and cracking, its articles now also cover a wide range of topics including cyber security, physical security, hacking, cryptography, counter culture, and international news.

Phrack has been described as having "its finger on the pulse of hacker culture", and being "hugely influential in the early days of hacker culture".

The magazine is run and published by a team of international volunteers and security professionals. It is available for free.

Issues of Phrack are divided in volumes, covering one or more years of publication. Phrack's latest issue is #72.

So far, there have been five major hardcopy releases and various smaller "special edition" hardcopy releases.

Each major hardcopy release contains most (but not all) articles of the e-zine release. The printed edition is always released at hacker conferences/camps and always for free and usually a few days before the online release.

Occasionally, Phrack releases a "special edition" hardcopy as well. These are smaller editions, containing three classic articles, three rejected articles (also known as "Off The Record" articles), and three articles from the upcoming release.