Marvelous Entertainment Inc. (株式会社 マーベラスエンターテイメント, Kabushiki-gaisha Māberasu Entāteimento) (MMV) was a multinational corporation that produced animation, music, video games and television series.

Locally, MMV was involved in a number of forms of entertainment, including the production of anime and music by their two subsidiaries Artland and Delfi Sound respectively.

Artland is an animation studio that produced a number of popular manga and anime including the award-winning Mushishi and the hit shōnen Katekyō Hitman Reborn!, and Delfi Sound is a recording studio that was involved in the production of a number of albums, radio dramas, and soundtracks since its establishment in 2005.

In 2011, AQ Interactive merged with Marvelous Entertainment (along with mobile gaming company Liveware).

On March 20, 2007, Marvelous Entertainment Inc. announced a restructuring plan that would transfer amusement business to Atlus, by moving it to Mad (株式会社マッド) as a wholly owned subsidiary of Marvelous Entertainment Inc., which would be established on June 1, 2007; the remaining businesses would be operated under Marvelous Entertainment Inc.[3] The transfer also included sale of The Third Planet (株式会社ザ・サードプラネット) amusement operations, effective on July 1, 2007.

[5] Delfi Sound Inc. (株式会社デルファイサウンド) It is a recording studio, album production, and music label company.

On December 24, 2004, Marvelous Entertainment Inc. announced the establishment of a London-based joint venture company called Rising Star Games Limited with Bergsala AB.

[3] MMV decided to gain a foothold on the European market first because most Japanese publishers have not really focused on it.

[3][9] On May 9, 2008, Marvelous Entertainment Inc. and Xseed Games announced they had entered a co-publishing partnership.