Monthly Shōnen Ace (月刊少年エース, Gekkan Shōnen Ēsu) is a monthly shōnen manga magazine in Japan published by Kadokawa Shoten, started in 1994.

Unlike the big shōnen weeklies with circulation figures in the millions, Ace is aimed at a less mainstream audience, and has a particular emphasis on anime tie-ins.

An online version of the magazine, titled Shōnen Ace Plus was launched in June 2019.

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