Similar to in the U.S., there are literally dozens of wrestling promotions in Japan of various sizes. To similify things to get things started, I am going to just focus on eight of the more popular promotions in Japan. Once you get into it, you might find you love one of the promotions I don't even mention, but this is generally where people get started.

New Japan Pro Wrestling Founded: 1972 Offical Site: http://www.njpw.co.jp Legendary Stars: Antonio Inoki, Tiger Jeet Singh, Tatsumi Fujinami Current Stars: Hiroshi Tanahashi, Shinsuke Nakamura, Jushin Thunder Liger American Wrestlers Used: Vader, Scott Norton, Hulk Hogan Style: Strong Style Promotion Popularity: Highest	All Japan Pro Wrestling Founded: 1972 Offical Site: http://www.all-japan.co.jp Legendary Stars: Giant Baba, Jumbo Tsutura, Mitsuharu Misawa Current Stars: Keiji Mutoh, Suwama, Masakatsu Funaki American Wrestlers Used: Stan Hansen, Abdullah the Butcher, Terry Gordy Style: Tradition/Entertainment Hybrid Promotion Popularity: Very High
Pro Wrestling NOAH Founded: 2000 Offical Site: http://www.noah.co.jp Legendary Stars: Mitsuharu Misawa, Kenta Kobashi, Jun Akiyama Current Stars: Go Shiozaki, Naomichi Marfuji, KENTA American Wrestlers Used: Bryan Danielson, Nigel McGuinness, Scorpio Style: King's Road Promotion Popularity: Very High	Dragon Gate Founded: 2004 Offical Site: http://www.gaora.co.jp/dragongate Legendary Stars: Magnum TOKYO, Milano Collection AT, SUWA Current Stars: YAMATO, CIMA, Naruki Doi American Wrestlers Used: Jack Evans, Matt Sydal, Young Bucks Style: Fast paced, high impact Promotion Popularity: High
Big Japan Pro Wrestling Founded: 1995 Offical Site: http://www.bjw.co.jp Legendary Stars: BADBOY Hido, Tomoaki Honma, Mitsuhiro Matsunaga Current Stars: Yuko Miyamoto, Jun Kasai, Ryuji Ito American Wrestlers Used: MASADA, Necro Butcher, Abdullah the Butcher Style: Hardcore Promotion Popularity: High	ZERO1 Founded: 2001 Offical Site: http://www.z-1.co.jp/index.html Legendary Stars: Shinya Hashimoto, Takao Omori, Wataru Sakata Current Stars: Kohei Sato, Shinjiro Ohtani, Ryouji Sai American Wrestlers Used: Steve Corino, Samoa Joe, Alex Shelley Style: Traditional Promotion Popularity: Moderate
Michinoku Pro Wrestling Founded: 1993 Offical Site: http://www.michipro.jp Legendary Stars: Great Sasuke, Jinsei Shinzaki, Tiger Mask IV Current Stars: Fujita Jr Hayato, Kenou, Takeshi Minaminno American Wrestlers Used: Rarely Style: Indy Promotion Popularity: Regional	Osaka Pro Wrestling Founded: 1999 Offical Site: http://www.osaka-prowres.com Legendary Stars: Super Delfin, Ebessan (Kikutaro), Condor Current Stars: Billy Kenkid, Tigers Mask, Atsushi Kotoge American Wrestlers Used: Rarely Style: Indy Promotion Popularity: Regional