It's fine but they're not quite real piracy.
Ignoring the 1,100 episode behemoth in the room:
Captain Harlock - Your quintessential, classic, trope-defining space pirate.
Outlaw Star - Space outlaws, not pirates but the antagonists are all pirates. Close enough.
Mars Daybreak - Actual water pirates. But it's submarines. On Mars. With mechs.
Honorable mention: Gargantia on the Verdurous Planet. Not really pirates, but anime waterworld so there's a pirate-adjacent style.
Technicality: Black Lagoon. In the modern "criminals with a boat and guns who will rob and/or kill you" sense of the term.
Edit: Not anime, and I don't even remember how it ended or if it was actually good, but I'd be remiss for not bringing up Pirates of Dark Water.
It's fine but they're not quite real piracy.
Ignoring the 1,100 episode behemoth in the room:
Captain Harlock - Your quintessential, classic, trope-defining space pirate.
Outlaw Star - Space outlaws, not pirates but the antagonists are all pirates. Close enough.
Mars Daybreak - Actual water pirates. But it's submarines. On Mars. With mechs.
Honorable mention: Gargantia on the Verdurous Planet. Not really pirates, but anime waterworld so there's a pirate-adjacent style.
Technicality: Black Lagoon. In the modern "criminals with a boat and guns who will rob and/or kill you" sense of the term.
Edit: Not anime, and I don't even remember how it ended or if it were good, but I'd be remiss to not bring up Pirates of Dark Water.
It's fine but they're not quite real piracy.
Ignoring the 1,100 episode behemoth in the room:
Captain Harlock - Your quintessential, classic, trope-defining space pirate.
Outlaw Star - Space outlaws, not pirates but the antagonists are all pirates. Close enough.
Mars Daybreak - Actual water pirates. But it's submarines. On Mars. With mechs.
Honorable mention: Gargantia on the Verdurous Planet. Not really pirates, but anime waterworld so there's a pirate-adjacent style.
Technicality: Black Lagoon. In the modern "criminals with a boat and guns who will rob and/or kill you" sense of the term.