Mazinkaiser (マジンカイザー, Majinkaizā?) is an anime OVA series, inspired by Go Nagai's Mazinger series. The OVA follows Kouji Kabuto, Tetsuya Tsurugi and the rest of the "Mazinger Team" as they fight against Dr. Hell's Mechanical Beasts.

An army of machines, led by Baron Ashura, defeats Kouji's Mazinger Z and Tetsuya's Great Mazinger. In the aftermath, Kouji stumbles upon a forgotten laboratory. Inside, he finds Mazinkaiser, the most powerful robot ever built. The series chronicles Kouji's experience with the machine as he copes with Kaiser's power while defeating Dr. Hell's forces.

The OVA's design is inspired by the original Mazinger Z manga from 1972, rather than Toei Animation's TV series. Mazinkaiser emulates Go Nagai's character designs, and its operatic plot is supported by a "tongue-in-cheek" cynicism in regards to the gratuitous sex and violence. Some of the Episodes draw their plot elements from the Mazinger Z manga, "Episode 3: Kouji Assassination Order!" being a good example.

An English version was released by ADV Films in 2003.

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