John Charles Dvorak (born 1952 in Los Angeles, California) is an American columnist and broadcaster in the areas of technology and computing. His writing extends back to the 1980s, when he was a mainstay of a variety of magazines. Dvorak is also the Vice-President of Mevio (formerly named PodShow) & well known for his Work for Tech TV.

Dvorak was on the start-up team for CNET Networks, appearing on the television show CNET Central. He also hosted a radio show called Real Computing on NPR, as well as a television show on TechTV (formerly ZDTV) called Silicon Spin.

He now appears on Marketwatch TV and is a regular panelist on This Week in Tech, a Netcast audio program hosted by Leo Laporte and featuring other former TechTV personalities such as Patrick Norton, Kevin Rose, and Robert Heron. As of December 2005, that "TWiTcast" regularly ranks among the top 5 at Apple's iTunes Music Store. Today it is regarded as being one of the most popular and important podcast on the internet. Dvorak also participated in the first and only Triangulation podcast, a similar co-hosted technology discussion program. In March 2006, Dvorak started a new show called CrankyGeeks in which he leads a rotating panel of "cranky" tech gurus in discussions of technology news stories of the week.

PodShow recently hired Dvorak as Vice president & Managing Editor for a new PodShow TECH channel. He will be managing content from existing PodShow tech programming as well as hosting "Tech5", where Dvorak recaps the day's tech news in about 5 minutes

Dvorak also co-hosts a podcast with Mevio co-founder Adam Curry called No Agenda. The show is a free flowing conversation about the week's news, happenings in the lives of the hosts and their families, and restaurant reviews from the dinners John and Adam have together when they are in the same city (usually San Francisco). Adam usually has more outlandish opinions of the week's news or world events while Dvorak plays the straight man in the dialogue.

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