D3 Publisher is a Japan video game publisher, established in July 1999 by Yuji Ito, and currently a subsidiary of Fields Corporation. It is known for its Simple series of low-priced console game.
The name stands for Domain 3 and refers to the three publishing domains the company originally intended to enter - computer and video games, music and books - although the company now exclusively publishes console game. The company currently operates a subsidiary in the United States of America, D3 Publisher of America, and a joint venture with Italy company Digital Bros. in Europe, D3DB Srl.