Inuyasha season 4

The fourth season of the anime television series Inuyasha aired in Japan on Yomiuri TV from October 13, 2003, through September 13, 2004. Based on the manga series of the same title by Rumiko Takahashi, the anime was produced by Sunrise. The series continues a half demon Inuyasha's and a high school girl Kagome Higurashi's journey alongside their friends Shippo, Miroku and Sango to obtain the fragments of the shattered Jewel of Four Souls, a powerful jewel that had been hidden inside Kagome's body, and keep the shards from being used for evil.

The anime is licensed for release in North America by Viz Media. The English dub of the fourth season was broadcast on Cartoon Network as part of its Adult Swim programming block from January 11, 2006, through October 27, 2006.

In Japan, the fourth season was retroactively collected under the title Fierce Battle Arc (激闘編).

Six pieces of theme music are used across this season; two opening themes and four ending themes, with two of the endings being used for special episodes. The opening themes are "One Day, One Dream" by Tackey & Tsubasa for episodes 128–153 and "Angelus" (ANGELUS -アンジェラス-) by Hitomi Shimatani for episodes 154–167. The two regular ending themes are "Come" by Namie Amuro for episodes 128–146 and "Brand-New World" by V6 for episodes 149–166, while the two special ending themes are the very first opening and ending set used for the anime series: "Change the World" by V6 for episodes 147–148 and "My Will" by Dream for episode 166–167.