Queen Emeraldas (Japanese: クィーン・エメラルダス, Hepburn: Kuīn Emerarudasu) is a manga written and illustrated by Leiji Matsumoto, later adapted into a four-episode anime OVA of the same name.

The storyline follows a young boy named Hiroshi Umino (海野広) who sneaks aboard a freighter in order to leave Earth.

However, the train is saved by a mysterious and incredibly powerful spaceship (which also bears the insignia) and is able to make it to their destination, a desert planet with a Western atmosphere, complete with saloons and bar fights.

In the second episode, after a final confrontation with Eldomain and later with Queen Baraluda (女王バラルーダ), of Arfess (アルフレス), Emeraldas presents Hiroshi with the Cosmo Dragoon once owned by Tochiro.

While the story can stand on its own, independent of Matsumoto's other works, it mostly assumes that the viewer has seen the other Harlock titles, especially Galaxy Express 999 (the TV series and the films), which featured Maetel, Emeraldas' sister, but had the occasional appearance of Emeraldas (note: Maetel, for some reason in the English dub is referred to as Mataire).

Queen Emeraldas first two episodes were produced by Oriental Light and Magic (OLM) and licensed for American distribution by ADV Films, being one of their earlier releases on the DVD format.

This illness is alluded to in the recent manga where Emeraldas does not engage in much physical action due to her weakened condition.

In the original Captain Harlock series in episode 30 ("My Friend, My Youth"), Emeraldas is shown to have a younger brother, but no sister is ever mentioned.