What Are The Best Fantasy Books About Mermaids?

Mermaid fiction kind of splits into a couple distinct camps that scratch different itches for me, and I’d need a whole bookshelf to cover them all. First, the coastal gothic or historical fantasy take, like 'The Mermaid of Black Conch' by Monique Roffey—less about sparkly tails and more about loneliness, obsession, and being a creature out of time. It’s got this haunting, literary vibe that sticks with you. Then there’s the pure romantic fantasy side. 'To Kill a Kingdom' is basically a Little Mermaid retelling but with pirate princes and heart-stealing siren royalty; it’s all banter and dark oceanic magic. But honestly, if you want something truly unique in the fantasy space, you should look into some of the indie-published stuff on platforms like Royal Road. There’s a whole niche of ‘merfolk civilization’ stories that build entire underwater societies, magic systems based on tides and bioluminescence, and political intrigue between different oceanic clans. It’s less romance-focused and more world-building heavy, which I personally love. Sometimes the big trad-pub books feel like they’re just retreading the same old fairy tale, while these web serials go off in wild directions, like a merfolk protagonist who’s essentially a deep-sea archaeologist uncovering drowned cities. That sense of discovering a fully realized, alien world beneath the waves is what I’m usually hunting for.

I just finished rereading the 'Waterfire Saga' by Jennifer Donnelly and it's such a solid bet for this. The world-building is surprisingly political, with different undersea realms at war, which gives it more weight than a simple romance. The main character, Serafina, starts off pretty sheltered and has to grow into her power, which really works for the coming-of-age feel. It's got that classic quest structure but underwater, and the magic system tied to song spells is genuinely clever. I liked that the romance was present but didn't completely overshadow the plot about stopping an ancient evil. The series is complete too, which is a plus—no waiting years for a finale that might disappoint. Another one I'd throw in is 'The Lost Voices' trilogy by Sarah Porter. This one is darker. The mermaids here are girls who have suffered and been transformed, and they're kind of vengeful, luring ships to crash. The moral ambiguity of the protagonist, Luce, torn between her new family and her human past, makes it a more complex read. It's less about glittery tails and more about the haunting, almost monstrous side of the mythology. It's not a comfortable read, but it's memorable and different from the pack.