Rebuild World IV Gensekai to Kyuusekai no Tousou
| Volume Title | Rebuild World IV Gensekai to Kyuusekai no Tousou |
| Japanese Volume Title | リビルドワールドIV 現世界と旧世界の闘争 |
| Light Novel | Rebuild World |
| Publisher | ASCII Media Works |
| Light Novel Label | DENGEKI |
| Author | Nafuse |
| Illustrators | Gin, yish |
| Release Date | March 17, 2021 |
| Pages | 388 |
| ISBN-10 | 404913490X |
| ISBN-13 | 978-4049134902 |
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