10 Sci-Fi Alien Monster Romance Books

Are you looking for a romance book with aliens that look like aliens? A sci-fi romance set in a faraway galaxy? With a monstrous hero or three?

If so, you’ve come to the right place! We’ve collected a list of books with heroes that look – and behave – distinctly non-human. They have tails, horns, wings, and other appendages *winkwink* to make an average human envious. So if you’re into monstrous heroes from outer space, take a look at these sweet and steamy sci-fi romance books below!

Curious about monster romance beyond aliens? Read more about monster romance here!

1. Ice Planet Barbarians by Ruby Dixon

No science fiction romance list would be complete without Ice Planet Barbarians! If you haven’t read this series yet, now is the time to grab it!

You’d think being abducted by aliens would be the worst thing that could happen to me.

And you’d be wrong.

Because now, the aliens are having ship trouble, and they’ve left their cargo of human women – including me – on an ice planet.

And the only native inhabitant I’ve met?

He’s big, horned, blue, and really, really has a thing for me…

2. Desire in His Blood by Zoey Draven

We call the Kylorr demons. Monsters. Never in a million years did I expect to call one husband

I’m drowning under the weight of my father’s debts. Working myself to the bone, I know that if I don’t pay them off in time, the sadistic creditors will take everything: our home, our respected name, and, worst of all, my two beautiful sisters.

To save my family, I agree to do something reckless: marry a wealthy and mysterious stranger, who offers me a wicked bargain I can’t afford to refuse.

However, his bargain comes with one terrifying catch. Because my husband-to-be is a Kylorr. One of the most fearsome alien races, the Kylorr are beastly monsters, all muscle and menace, with powerful wings, depraved cravings, and berserker-like rages. The worst part?

They survive on blood.

Cold and cruel, Azur of House Kaalium, the High Lord of Laras, demands me as his blood bride. To feed from me. To use my body in whatever way he wishes.

But if Azur expects a demure, submissive wife, he’ll be in for a rude awakening. My new husband might crave my surrender but there’s one thing I’ll never give him.

My heart…even if he wants to shatter it into a million pieces.

3. Viper by Naomi Lucas

Long have we been alone.

Without brides, without females to warm us during the long nights. Without sweet mates.

But we see them, from afar, brides that could be ours. Kept away from us by walls and weapons. Females we long for greatly.


Human females.

And the one with red hair? I want her. I saw her first. I will fight to the death for her.

She is MINE.

So, we’ll come together and make an exchange with their men that will benefit us all.

After that?

To the winner goes the spoils…

Let the hunt begin.

But the red-headed female is MINE.

Viper is the first book in a series of Bride Hunting Aliens. With the charm of a snake, and the wiles of a devil, these males will do anything, and I mean anything, for their females.

4. A Monster’s Treasure by Lynnea Lee

Unfairly convicted of a crime, I’m sent to serve the Kadrixan males for their rutting season.

The Kadrixans. Even their name inspires terror. Fiery-skinned and devil-like, they stand head and shoulders taller than any human man. Our colony made a terrible bargain with these monsters. The Kadrixans give us precious ore in exchange for the one thing they need.

Women. Like me.

When we meet our Kadrixan captors, I come face to face with a massive, brawny beast who claims I belong to him.
And not just for the rutting season. He wants me forever.

I never expected to claim a human mate, but one look at the curvy female and I know she’s mine.

Hunger claws at my mind and that of every other warrior in my regiment. All of us are on the brink of the rut which makes us more belligerent with each passing day. Without females, we’ll tear each other apart with rage.

We depend upon our bargain. Human females for Kadrixan ore.

The females arrive and there is one who stirs my primitive desire: Clara. She thinks I’m a monster; I see it in her eyes and scent it in her fear. She vows to return to her people after the rut is over, but I vow to claim my mate, to woo her and prove she’s mine.

5. Ensnared by Tiffany Roberts

He’s spent years as a hunter, but now he’s the one ensnared in a creature’s trap.

Ketahn did not want a mate. Fate has a different plan for him. When the queen he despises declares her intention to claim him, he retreats into the jungle.

What he finds there changes his world.

Small, delicate, and pale skinned, Ivy Foster is nothing like the females Ketahn has known. She’s not of his kind at all. Yet the moment he sees her, he knows the truth in his soul—she is his heartsthread.

And now that he has her, he won’t let anything take her away. Not the jungle, not the gods, not the queen and her warriors.

Whether Ivy agrees or not, their webs are entangled. No one will ever sever those threads.
Book 1 of 3 in The Spider’s Mate Trilogy.
Warning: Contains darker themes and there is also a cliffhanger. Check the author’s website for more detailed content warnings.

6. I Married a Lizardman by Regine Abel

Scaly, grumpy, but oh so cuddly…

As a third daughter on the farming colony of Meterion, Susan’s future prospects aren’t too promising. A pretty face, top-notch skills, and hard work mean nothing if your dowry doesn’t include fertile lands. With her twenty-fifth birthday approaching, and no suitors even remotely sniffing in her general direction, Susan will be forced to leave the family lands to work as an indentured servant in the capital city. Her only way out is to settle for an arranged marriage through the PMA – the Prime Mating Agency. She just never expected to be paired to a grumpy, massive lizardman, and above all not to grow so fond of his scales and quirky ways.

With everything going on, the last thing Olix needs is a mate, especially a squishy, scaleless, off-worlder with strange ways, and an obsession with farming. He is a Hunter, not a dirt digger. The Seer must have been mistaken when she insisted that, for the sake of the people, he take a mate from the stars. How can such a tiny thing be their salvation? And yet, his Susan’s softness is disturbingly addictive while hiding a surprising resilience.

With his ancestral lands on the line and the future of the clans threatened, could this wisp of a woman turn their fate around?

7. The Scorpion’s Mate by Susan Trombley

Claire has never really fit in with everyone around her, but she’s carved out a life for herself using her own unique style and artistic ability to support herself on the Internet. The last thing she expects is to be abducted by aliens and dropped into a research facility, where a genetically-engineered alien soldier chooses her as his life-mate.

Thrax’s pheromones are compelling, and his status as a fellow unwilling test subject makes them allies, but Claire isn’t certain she can trust someone who is convinced she belongs to him, when all she wants to do is find a way to return home to Earth—a place that her devoted alien can never follow, because there’s no way the scorpion-like alien would ever be able to pass for human.

Still, she’ll accept help where she can find it, so she doesn’t hesitate to escape with Thrax from the facility, though their time running from their pursuers in the warrens beneath the research facility will forever change Claire, and could make it impossible for her to return to Earth.

But will there be anywhere else in the galaxy they can go where their love will be accepted?

This alien romance features an alien hero who actually looks alien, strong language, violence, and open door intimate scenes.

8. Matched to the Monster by Rena Marks

I’m human. He’s not.

As the First Daughter of Planet Earth, it’s my duty to set an example. When we enter an agreement to re-build the planet, our prized offerings for bargaining are our young, eligible females, starting with me. It’s my place to lead by example and I’m only too eager. I can hardly wait to see what handsome, mysterious stranger has been matched for me. Who will sweep me off my feet?

I never expected tentacles.

The Match Program put together by the Britonian race assures my people that mates from a human planet would be a perfect pair up for us in exchange for our plentiful gold. But those females think of us as monsters. Instead of them allowing us to honor them, they shiver in fear and wish for us to treat them as slaves. They have been taught this way from birth.

On a planet of beautiful, plentiful females repressed by their own males, who are really the monsters?

This is the first book in the Matched Program Series.

The gorgeous species called Britonians had left their planet with a dying sun. They reached an agreement with Earth to clean up our ruined planet with their modern technology in exchange for a new place to live. If it were up to women, we’d allow them to live just to look at them. The Brits are amazing, gold skin, tall and muscular, like avenging angels.

When they hear that most of our men died in the third World War, leaving the sexes vastly mismatched, they offer to begin a Match Program with a distant planet in need of females. It will be completely professional, personality-matching, compatibility, and the possibility of procreation. Plus, the human females will have a guaranteed choice after six months: Remain with your alien mate, or come home to Earth.

None of us expected the gorgeous alien species to introduce us to horrifying monsters.

9. Chosen by Stacy Jones

One minute Lily is trying, and failing, to run her grandmother’s farm—her last remaining connection to her family. The next, she wakes to find herself in a cold, sterile cage surrounded by monsters, with no memory of how she got there. Accidentally abducted by alien poachers, unsure if she will live or die, she is dreading the worst. What she doesn’t expect is for her captors to dump her on an alien planet to fend for herself. Now, she must fight to survive the planet… or die trying.

Frrar, Tor, and Arruk have been searching endlessly for a mate to belong to, someone to finally accept them, but they are losing hope. The time of cleansing, when the great waters drown the land, draws near. They are on the verge of abandoning their search and fleeing the forest when they spot a strange, tiny, two-armed female. They are immediately drawn to her, fascinated by her differences, but they must act fast to save her life, and their own, from the coming flood.

Thousands of copies sold internationally. Millions of pages read. 2800+ reviews on Amazon and Goodreads. Chosen is the first book in the award-winning Chosen Series. This New Adult Paranormal/Fantasy RH is packed full of romance, drool-worthy heroes, adventure, and an extraordinary world.

10. Catnapped by the Catman by Jade Waltz

Thick, silky and purrs for hours…

Always the bridesmaid, but never the bride.
That’s what I’m known for amongst my large group of friends and family.

Arriving home alone from another wedding very much single not only sucked but only solidified the fact that I may never find love—and that I couldn’t even afford to join the wedding party on the space cruise.

It’s okay. I’ve learned to accept my fate in life.
All I needed was my best friend, Loki, who would never betray me…. Much.

Little did I know, my cat had plans for me…

Catnapped by the Catman is a full-length standalone sci-fi slow burn romance featuring a heroine whose life is turned upside down, a growly, protective feline hero, and a tricky black cat who only wants the best for his ‘princess’.

If you like sexy alien-looking aliens, sweet-n-steamy romance, and thrilling adventure, you’ll love this series. No cheating, no cliffhanger, and a happily ever after guaranteed for each couple! Each book in the series can be read as a standalone, but for maximum enjoyment, it’s recommended that the series be read in order.

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