|Debut||July 17, 2013|
|Labels|| GloryHeaven (2009—2012)|
|Current Members|| Ta_2 (Vocalist)|
|Past Members|| R.O.N (Guitarist)|
OLDCODEX (オルドコデックス Orudokodekkusu) is a Japanese rock band that was formed in 2009 in Tokyo, Japan. The band have released a total of five studio albums, three extended plays and fifteen singles. They performed the opening themes for the Free! series since the first season, and the ending theme of the movie High☆Speed！－Free! Starting Days－.
The rock band also produce and perform songs for other well-known anime series such as Kuroko no Basket, God Eater and SERVAMP.
- Ta_2 (AKA Tatsuhisa Suzuki and CV. of Makoto Tachibana)
- Ryo Yamagata
- Taizo Nakamura
- Shinji Ōmura
The name of the band was created by combining the words “OLD” and “CODEX”, the former meaning "of old age or the past", and the latter meaning “manuscripts, such as the Bible”.
| Released on July 17, 2013|
| Released on July 30, 2014|
| Released on December 16, 2015|
| Released on July 25, 2018|