Idea Factory Holdings Co., Ltd. (アイディアファクトリー株式会社, Aidia Fakutorī Kabushiki-gaisha) is a Japanese video game developer and publisher founded by former Data East employees in October 1994.

A division of the company makes otome games under the name of Otomate (see list below).

An international branch, Idea Factory International, was opened in California in 2013.

[1] Altergear, a division of Idea Factory that focuses on male-centered visual novel stories, was created in 2022.

[2] The following sublist are otome games that were developed by Idea Factory's Otomate division.