| Monthly Comic Rex | |
| Frequency: | Monthly |
| Circulation: | 100,000[1] |
| Category: | Shōnen manga |
| Publisher: | Ichijinsha |
| Firstdate: | December 9, 2005 |
| Country: | Japan |
| Language: | Japanese |
| Website: | Monthly Comic Rex |
is a Japanese shōnen manga magazine published by Ichijinsha. The first issue was sold on December 9, 2005, and is sold monthly on the ninth. Manga collected into bound volumes which were serialized in this magazine are published under Ichijinsha's imprint.
The four-panel comic strip magazine Manga 4koma Kings Palette started as a special edition of Comic Rex before becoming an independent magazine, as did the cross-dressing-themed manga magazine Waai!.[2]