Idea Factory is a Japanese videogame developer and publisher, founded on October 26, 1994 by former employees of Data East. Its subsidiaries are Compile Heart, Design Factory, and Otomate.

A Western branch was opened in the United States of America in September 2013. This branch is primarily meant as a central hub for marketing and discussing its titles outside of Japan, even those that are not yet localized. However, they started localizing titles by themselves of their subsidiaries that other publishers declined to release as of May 2014. They also are beginning to dabble in PC ports via Steam, staring with the three Hyperdimension Neptunia: Re;birth games and Fairy Fencer F.

Games developed by Idea Factory:

Agarest Senki series (co-developed with Compile Heart and Red Entertainment)
- Agarest Senki
- Agarest Senki Zero
- Agarest Senki 2
- Agarest Senki Marriage
Amnesia: Memories
Arcana Famiglia
Apocalypse: Desire Next
Brothers Conflict
Chaos Wars
Code:Realize
- Code:Realize ~Future Blessings~
- Code:Realize ~Wintertide Miracles~
Collar × Malice
Cross Edge (co-developed with Compile Heart)
Dark Rose Valkyrie (co-developed with Compile Heart)
Diabolik Lovers series (co-developed with Rejet)
- Diabolik Lovers Haunted Dark Bridal
- Diabolik Lovers More, Blood
- Diabolik Lovers Vandead Carnival
- Diabolik Lovers Dark Fate
- Diabolik Lovers Lunatic Parade
- Diabolik Lovers Lost Eden
Diario: Rebirth Moon Legend
Dragon Star Varnir (co-developed with Compile Heart)
Generation of Chaos series
- Generation of Chaos
- Generation of Chaos Next
- Generation of Chaos III
- Generation of Chaos IV^note
- Aedis Eclipse: Generation of Chaos
- Generation of Chaos: Pandora's Reflection (co-developed with Sting)
Hakuouki
Hiiro no Kakera
Gakuen K
Juuzaengi
Kamigami no Asobi
Mist of Chaos
Neptunia series (co-developed with Compile Heart, Gust, Nippon Ichi and 5pb)
- Hyperdimension Neptunia
- Hyperdimension Neptunia mk2
- Hyperdimension Neptunia Victory
- Megadimension Neptunia VII
- Hyperdimension Neptunia Re;Birth1
- Hyperdimension Neptunia Re;Birth2 SISTERS GENERATION
- Hyperdimension Neptunia Victory Re;Birth3: V Generation
- Megadimension Neptunia VIIR
Neverland / Spectral series:
- Spectral Tower
- Spectral Force
- Spectral Force 2
- Spectral Tower 2
- Spectral Force 3: Innocent Rage
- Spectral Force Genesis
- Spectral Gene
- Spectral Souls
- Spectral Souls: Ressurrection of the Ethereal Empires
- Blazing Souls
Spectral Vs Generation (co-developed with IGS)
Norn9
Octomania (co-developed with Compil eHeart and Hyper-Devbox Japan)
Olympia Soiree
Sweet Fuse: At Your Side
Ore no Yome: Anata Dake no Hanayome
Rec: Doki Doki Seiyū Paradise
Trinity Universe (co-developed with Gust and Nippon Ich)
Uwasa no Midori-kun!! Natsuiro no Striker
Uwasa no Midori-kun!! Futari no Midori?!