25 Sci-Fi Romance Books That Will Make You Swoon

When Duncan Reid books a fancy cruise vacation, he gets much more than he bargained for. In fact, he never makes it to his destination, but is accidentally transported to 4000 BCE by a glitchy time machine. 

He isn’t the only one to find his or herself displaced: a 4th-century Hun, a medieval Russian, and a beautiful priestess named Erissa are in the same predicament. In order to return to their respective time periods, these wayward travelers must become active players in the doomed world of Atlantis. But is Duncan willing to risk his life for an era where there is no Erissa?

In this start to a four-book space saga, we’re introduced to Tess—sister to a powerful ruler of the Chapalii alien empire—who seeks a fresh start on the planet Rhui. Shortly after arriving, she meets the Jaran people, who have roots stretching back to the days of Earth’s independence. 

But as she slowly falls for their leader, Illya, their growing relationship is tested by the impending war. Will Tessa betray her brother and support the Jaran campaign? Or will she remain loyal to her blood, and turn her back on the man she’s come to love so deeply?

This 1982 cult classic has been praised by everyone from John Updike to The New Yorker, who called it “the perfect novel.” After a lonely housewife learns of a sea monster's escape from a local facility, she sees the creature walk through her own door—and, eventually, into her welcoming arms. 

The two begin a passionate affair that heals past wounds and gives them hope, though the possibility of discovery is a constant threat to their relationship. Quirky but heartwarming in its exploration of love, loss, and freedom, Mrs. Caliban is a must-read for fans of The Shape of Water.

Constance O'Day-Flannery was a pioneer of sci-fi romance books, being one of the first to write time travel love stories. In Time After Time, widowed Kelly is putting her life back together when she's suddenly thrown into the post-Civil War era. In New Orleans, she encounters Daniel, who looks remarkably like her late 20th-century husband. 

Adding to the oddness is the fact that Kelly looks like Daniel’s late spouse, too. But could all of this simply be a figment of Kelly’s distressed imagination? Or is her relationship with Daniel based in reality—and do they have a future together? 

Nora Roberts gave high praise to O’Day-Flannery’s time-traveling romances, saying, “She proves that love is timeless.” We agree!

Jana Greyson is a brilliant young woman leading an ordinary life as a medical researcher in Texas. Then the Commander of the starship Wanderlust, Varian Saar, kidnaps her away to the stars. 

It was supposed to be a mutually beneficial arrangement—Earth is in trouble, and Saar’s people have been afflicted with a virus that has left them with no more women to carry on their species. But things never turn out as easily as you think they will…

Their love is forbidden, their lives are in increasing danger, and their growing passion is absolutely undeniable. Author Janelle Taylor’s star-faring romance world continues in the Moondust series with Stardust and Shadows, Starlight and Splendor, and Moonbeams and Magic.  

Linnea Sinclair is one of the most popular authors of sci-fi romance, and this RITA-nominated novel is one of her best. While fixing her starfreighter, Tribly is inconvenienced in the most unexpected way—a military officer, Rhis, falls straight out of the sky.

Though he's a Zafharin, Rhis defies all of Tribly's expectations—especially when they're forced into a shared fight for survival. But in trying to evade their enemies, will Tribly and Rhis ever confront the growing attraction between them?

If you’re still not quite sold on Finders Keepers, an Amazon review of the book described the main pairing like this: “Imagine Han Solo is a woman and Darth Vader isn’t really evil and isn’t more machine than man.” Now we’re talking!

This collaboration by Piers Anthony and Jo Anne Taeusch weaves elements of science fiction and magic into a delightful romance. Herb Moss is a genetically engineered half-man half-plant living on the planet New World. His life is going perfectly down a simple, carefully laid out path: he’s engaged to his childhood sweetheart, Lily, and he’s set for life working for his father. If Herb is at all bored with this bland plan, then a little bit of flirtatious correspondence with a stranger from another planet is just a harmless way to keep things interesting, right?

Spring is a sorcerer’s daughter living on the planet of New Land. Her life with her father Gabriel is great—except that secrets of incredible magical power are hidden deep within her mind, locked away until her true love can unleash them. When her father meets his untimely end, Spring seeks innocent comfort in a penpal that’s got his eye on a little extra spark.

They may not be on the same page, but they’ll have to get there quickly as a covetous wizard hunts for the secrets inside of Spring.

Readers of unconventional love stories will adore Love and Gravity, which Library Journal praised for its "high romantic notes" and “novel explanation for the development of calculus.” Since she was a child, Andrea has watched a mysterious boy through a crack in her bedroom wall. 

As her affection increases over time, she comes to realize that he not only returns her feelings—but that he’s actually a young Isaac Newton. When he begins writing letters to Andrea, somehow passing them through the veil of time, their love only intensifies. But how can two people separated by the laws of physics hope to have a happy ever after?

Released as a multi-part serial, Angel Payne’s Bolt Saga is a perfect pick if you’re hot for superheroes. Emmalina is working at a hotel when she has a steamy night with Reece Richards, her boss and the bad-boy-son of a family dynasty. 

Their chemistry is like lightning in a bottle, but Reece is more than an accomplished lover—unbeknownst to Emmalina, he’s the superhero, Bolt, too.

Illona Andrews is actually a husband and wife team known for their bestselling fantasies. But in this second book of their Kinsmen series, they reach for the stars. 

Shipped off to a new planet, Claire must hide her status as a “psycher”—someone who can harm others with her mind—if she hopes to survive in such foreign surroundings. 

Too bad these surroundings also include Venturo Escana, a man who shares Claire’s dangerous gifts. But when Venturo becomes her boss, Claire will find that concealing her talents is as difficult as concealing her most ardent desires…

In the mood for an erotic alien romance? You'll get it in this steamy novel, which stars a woman who's abducted by the nefarious Anzon...On their planet, Ariel becomes the prize in a battle between males of a lesser alien race—one of whom is the formidable warrior, Ral. 

When he emerges as the victor, he expresses in no uncertain terms that he means to claim Ariel, body and soul, forevermore. 

But as their relationship burns hotter than any day on Venus, these two lovers must also face the challenges of living in a world that doesn’t respect their freedom. 

In the year 2139, Tedra—a gorgeous but virginal Amazon—roams the stars, searching for a way to overthrow her misogynistic home government. Ironically, she stumbles upon a planet full of gruff, ignorant barbarians, where she unsuccessfully duels the sexy Challen Ly-San-Ter. 

Now at the mercy of his every wish, Tedra’s quest to save her planet takes a 30-day bedroom detour, during which Challen takes her places she’s never gone before. And no, we’re not talking about other galaxies.

Published in the 1990s, Warrior's Woman is the sort of old-school romance that takes us to the days we stole paperbacks from our mom's nightstand.

Sirantha Jax carries a rare gene that makes it possible for her to jump ships through grimspace. She uses this talent wisely, working as an accomplished investigator for the Corp. But when she wakes up in a jail cell with no memory of an apparent crash landing that killed everyone on the ship, her life takes an abrupt shift. For the cost of joining them to overthrow the Corp, a group of rogue fighters release her from her cell.

Jax’s uneasy integration into the group of rebels is snappy and exciting. And she’s certainly not immune to the charms of the enigmatic March…

For those who love the formidable heroine and the steamy love-hate relationship in Grimspace, check out the other five novels in the Sirantha Jax series!

Shards of Honor is the second book in Lois McMaster Bujold’s award-winning Vorkosigan Saga. It also happens to be one of the most romantic installments of the series: When survey captain Cordelia is taken prisoner by a Barrayan ship commander, she finds herself taking on the galaxy’s endless dangers at his side—and falls in love along the way.

Earth is under threat of an invading insectoid alien race, and the only hope the planet has for survival is the aid of the great Eon Warriors. Unfortunately, the Eons want nothing to do with Earth, and the human Sub-Captain Eve Traynor wants even less to do with the Eons. 

But to save her sisters from the threats of Earth’s Space Corps which wrongly imprisoned her, she’ll have to nab the Eons’ attention by kidnapping War Commander Davion Thann-Eon right off of his ship.

Davion is on a much needed and well-deserved vacation from protecting the Eon Empire when the tenacious Terran warrior abducts him. 

Eve drives him up the wall and piques his interest in equal turns, but after the vicious insect race attacks their ship and they make a crash landing on the hostile planet of Hunter7, they’ll have to find a way to work together. With so much on the line, their shocking and incendiary attraction could make things messy…

Penned by Nora Roberts under the pseudonym J.D. Robb, the massive In Death series is what Entertainment Weekly calls “Law & Order: SVU—in the future.” 

Set in the year 2058, the first installment sees Eve Dallas, a tough New York detective, investigate a series of grisly murders. Things get more complicated as she gets closer to the wealthy Roarke, a man who’s not only her prime suspect—but who's also pretty darn irresistible. 

The ensuing sexual tension is truly toe-curling (what else can you expect from a romance superstar?), but fans of science fiction and suspense will find the world-building and plot especially riveting.

Keirlan de Corizi has been hated his entire life for his strange blue skin and the rumors of dark magic that hang around him. Tarquin Secker is gifted with the outstanding ability to cross space and time and a moments notice. As Keir waits patiently for death to free him from his suffering, Quin is drawn to help the “Blue Demon of Adalucien,” and offers him sanctuary on her home planet of Lyagnius.

The calm and safety of Lyagnius doesn’t last for long—Keir accidentally unearths the alien powers deep inside of him, and gets himself exiled from the planet. 

Quin chooses to leave her home behind and follow him, for she has secrets of her own: a strange darkness that wishes to consume her. But will Keir be able to figure out how to use his new powers in time to save the woman who risked her future for him?

In this fast paced romance from Coleen Kwan,  Asher Quigley awakes one day in his workroom with visions of a beautiful woman. The woman is familiar but just out of reach in his mind. Still, Asher tries to focus on the task at hand: the creation of his most powerful and important invention yet– a time machine. When he is finished, he is ready to make history with the machine, until it is accidentally set off while he’s inside it.

Transported to eight months prior, Asher is reunited with the beautiful woman, Minerva Lambskin, who refused his marriage proposal. Asher is sure that his time machine somehow erased Minerva’s existence and he is ready to do whatever he can, even risk his own existence, to save the love of his life. 

Believed to have been dead for multiple years, Aurelia has actually been sailing through space with her crewmates, fighting for survival. Aurelia never would have imagined that after years of barely getting by, the downfall of the crew could be caused by a young stowaway. 

When Aurelia finds a girl, Kateryn, hiding in her room of the ship, she’s instantly suspicious of the secrets Kateryn holds. Kateryn is seeking revenge and ready to destroy Aurelia’s whole ship to get it. Everything is at stake, including Keys, Aurelia’s ship mate who she secretly loves. Can Aurelia save his life, and her own?

This is the third book from Cathy Pagau that takes place in the mining colony of Nevarro, following Rulebreaker and Caught in Amber. Each book contains a different intriguing romance, so they can be read in any order!

Colonial Mining Association agent Natalia Hallowell seeks distraction at a bar after being placed on administrative leave. There she meets Genevieve “Gennie” Caine and the attraction between them is instant. But Gennie has an ulterior motive. After seducing, drugging, and tying up Natalia, Gennie pleads her case. She needs Natalia’s help escaping from a big corporation that is after her. Although Natalia doesn’t trust Gennie, the two women must work together to fight a conspiracy deeper than either of them know. As anger and tension simmer between them, their attraction only grows. 

In this debut from author Ada Harper, Olivia Shaw is a Whisper agent, a covert government operative. Her only secret is that she is also a caricae, a woman capable of bearing children. In this society, caricae are controlled by the government and used for the sole purpose of breeding.

Liv is sent on a dangerous mission into the Quillian Empire, which is complicated when she is forced to take a man hostage and he turns out to be Galen de Corvus, the brother of the Quillian empress. Even worse, Galen is an altus, a man more capable of detecting the pheromones of a caricae. To Liv’s annoyance, their chemistry is undeniable and distracting.

The unlikely duo are forced to work together as rebels are attempting a coup and civil war breaks out. Liv must protect her secret as she is pushed into the center of political and military life. 

As their connection and attraction to each other grows deeper, Liv and Galen are put in danger and they must decide where their ultimate loyalties lie. 

Savan Bardan from the world of Rendar is the harshest trade negotiator in the galaxy. Brinn Fjord is a young but tough negotiator from the frigid planet of Perma. The two meet to discuss the possibility of a deal involving rare crystals found on Perma, an energy source greatly needed by Rendar. 

The two are immediate enemies. Years earlier, Salvan and Rendar had denied a trade deal that would have brought medical innovations to Perma which would have saved many lives, including that of Brinn’s own father. 

But when danger strikes, Savan and Brinn are put on the run from a mysterious killer, together. In the icy landscape of Perma, only their growing attraction to each other can keep them warm. But more secrets keep coming out…

This "sexy science fiction romance” takes place in the year 2950 and “will entirely satisfy fans of pulpy SF" (Publishers Weekly). Our world has undergone many wars and devastations and emerged as a new technological society where all kinds of biological enhancements are common. 

Felicia Sevigny is known for her ability to tell others their futures. Alexei Petriv is a part of a infamous crime syndicate, fighting against the system. When Felicia reads the cards that tell Alexei’s future, she sees them together in a fight for their lives against the government. Alexei may be an alpha male, but Felicia is prepared to check him every step of the way, as their chemistry sizzles and they embark on an honorable adventure.

“A mystical thrill ride” from a USA Today bestselling author (Booklist). Roan West is a psychometrist: he has the ability to tell the history of an object just by touching it. Some psychometrists have been focusing on out-of-place artifacts, or ooparts, which are objects found in places that are inconsistent with what is historically possible. 

Those who have been finding ooparts have started to disappear, including Roan’s close friend, Stuart. When Roan sees a viral video of a woman, Melicent Tilpin, discussing a rare pocket watch he knows he has to warn her. 

Together, Roan and Melicent set off on a journey to find Stuart and get answers about the vanishing of the psychometrist. Their mission takes them around the world and connects them to periods throughout history and along the way they find an unflinching romance between themselves. 

Catherine Asaro is the multi-Nebula Award winning author of many renowned science fiction books, multiple of which include compelling romantic plotlines. 

Earthbound, the first book in the Lightning Strike series, begins in 1987 LA where Tina Santis Pulivok is working as a waitress. Tina has had a hard upbringing and recently lost her cousin to gang violence. Weathered from her challenging life, Tina’s world is blown to pieces when she finds a man on the street working on an other-worldy glowing box. 

Althor is lost, coming from an alternate world and the year 2328. As Tina tries to help him get back on track, the military seizes his starfighter ship. Althor and Tina are sent on an intergalactic mission of romance and thrill to reclaim his ship and set the timeline straight before it is too late.