Monthly Shōnen Sirius (Japanese: 月刊少年シリウス, Hepburn: Gekkan Shōnen Shiriusu) is a Japanese monthly shōnen manga magazine published by Kodansha, and first issued in May 2005.

It is issued in perfect-bound B5 format and retails for 580 yen.

The magazine also serializes manga through their Twi Siri Twitter account.

[2]