Aliens are extraterrestrial life that does not originate from Earth. The sentient beings can range from simple bacteria-life organisms to complex species and individuals. Aliens are used in a variety of genres, most notably Science-Fiction.

Not a genre by itself, Aliens are a usually a character or creature used in Science Fiction and it's sub-genres.

Project Hail Mary
Bad Guy
Viper (Naga Brides #1)
Ensnared (The Spider's Mate, #1)
The Buff Beast (Exposed to the Elements, #4)
I Married A Lizardman
Lured (Tribes #3)
Tamed (Fated Mates of the Kalixian Warriors #9)
Under Strain (Rebel Cyborgs, #2)
Alien in Charge (Warriors of Gehar #1)
The Last Watch (The Divide, #1)
Victories Greater Than Death (Unstoppable, #1)
Greater Good (Star Wars: Thrawn Ascendancy, #2)
Feral (The Wrong Alpha, #2)
The Rock from the Sky
Project Hail Mary
Viper (Naga Brides #1)
The Galaxy, and the Ground Within (Wayfarers, #4)
An Absolutely Remarkable Thing (The Carls, #1)
Winter World (The Long Winter, #1)
Skyward (Skyward, #1)
A Desolation Called Peace (Teixcalaan, #2)
The Lost Colony (The Long Winter, #3)
A Beautifully Foolish Endeavor (The Carls, #2)
To Sleep in a Sea of Stars
A Closed and Common Orbit (Wayfarers, #2)
Starsight (Skyward, #2)
Aurora Rising (The Aurora Cycle, #1)
We Are Legion (We Are Bob) (Bobiverse, #1)
Obsidian (Lux, #1)
Onyx (Lux, #2)
The 5th Wave (The 5th Wave, #1)
The Host
Opal (Lux, #3)
Origin (Lux, #4)
Opposition (Lux, #5)
I Am Number Four (Lorien Legacies, #1)
The Infinite Sea (The 5th Wave, #2)
Shadows (Lux, #0.5)
Ender's Game (Ender's Saga, #1)
Alienated (Alienated, #1)
Ice Planet Barbarians (Ice Planet Barbarians, #1)
The Power of Six (Lorien Legacies, #2)

Related Genres

Toba Beta
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Toba Beta, Betelgeuse Incident: Insiden Bait Al-Jauza

Darynda Jones
Ambulances were cool. “You just want to fondle my extraneous body parts,” I said to the EMT as I picked up a silver gadget that looked disturbingly like an alien orifice probe, broke it, then promptly put it back, hoping it wouldn’t leave someone’s life hanging in the balance because the EMT couldn’t alien-probe his orifices.
Darynda Jones, First Grave on the Right

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