10 Clean Science Fiction Books (No Gore, No Language, Family-Friendly)

Science fiction opens the door to big ideas, unforgettable adventures, and worlds filled with mystery and possibility. These ten stories offer creativity, emotional depth, and imaginative exploration while keeping the focus on character, courage, and curiosity.

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Rating Summary

🟢 Green – Fully clean, kid-friendly, no graphic content; light and safe for all readers.

🔵 Blue – Mild emotional intensity or deeper themes; best for older children or confident middle-grade readers.

🟣 Purple – Moderate emotional depth or realistic situations; still fully clean and non-explicit, good for readers who can handle heavier themes.

All books are checked for strong language, graphic violence, and on-page sexual content, with additional content notes included when relevant.

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🔵 1. Last Day on Mars – Kevin Emerson

Series Chronicle of the Dark Star Book 1 of 3 Complete

Humanity prepares to leave Mars as the planet becomes uninhabitable, but two kids uncover evidence of sabotage and a deeper cosmic threat. Fast paced with strong worldbuilding and growing mystery. Written for Middle Grade / Teen readers.

Heads Up: Language:6 stupid, 1 jerk, 1 sucks, 1 darn, 4 shut up, 1 Bastards.

🟢 2. The Last Human – Lee Bacon

Standalone

In a world ruled by robots, a young AI discovers the last surviving human child. Their unlikely friendship sparks questions about history, freedom, and humanity written for Upper Elementary / Middle Grade readers.

Heads Up: Language: 3 stupid(est) environmental ideals.

🔵 3. Cog – Greg Van Eekhout

Standalone

A young robot learning to think for himself escapes a research lab to find the scientist who cared for him. The story blends humor, heart, and adventure in a thoughtful futuristic setting. Written for Upper Elementary / Middle Grade readers.

Heads Up: Language: 1 jerk (Listened to audio book so might have missed a word here or there.)

🔵 4. Masterminds – Gordon Korman

Series Masterminds Book 1 of 3 Complete

A group of kids living in a picture-perfect town begins to question everything when strange events reveal that nothing around them is what it seems. The mystery quickly deepens into a cross-country chase with high-stakes secrets, ethical dilemmas, and fast-paced twists. Written for Middle Grade / Teen readers.

🔵 5. The True Meaning of Smekday – Adam Rex

Series: Smek Book 1 of 2 Complete

After an alien invasion, a girl and a friendly alien team up for a wild road trip across America. Hilarious, creative, written for Middle Grade / Teen readers.

Heads Up: Language: 3 freaking, 30 stupid, 4 idiot, 9 dumb, 1 ass, 5 hell, 1 darn, 10 jerk(s), 2 crap, 13 shut up, 11 mostly Oh/My G-d, 1 Jesus, ghost references, cancer references, cigarette references. divorce reference. racism, 1 LGBTQ+ reference. Cartoon like violence.

🟢 6. The Last Cuentista – Donna Barba Higuera

Standalone

In a post-apocalyptic future, Petra is one of the last storytellers preserving human history after a space evacuation. Heartfelt, imaginative, and full of adventure. Written for Middle Grade / Teen readers.

Heads Up: Language:6 stupid, 1 well check hell, 6 Oh God. Hispanic Heritage.

🟢 7. The Wild Robot – Peter Brown

Series: The Wild Robot, Book 1 of 3 (series complete)

A robot unexpectedly awakens on a remote island and must learn how to survive among animals. Gentle science fiction with themes of empathy, belonging, and responsibility. Written for Upper Elementary / Middle Grade readers.

🔵 8. The Green Book – Jill Paton Walsh

Standalone

After Earth’s collapse, a family journeys to a distant planet where survival depends on creativity, community, and hope. Told from a child’s point of view, this quiet and thoughtful sci-fi explores resilience, cooperation, and the wonder of starting over. Originally written for Middle Grade / Teen readers.

🔵 9. The Ear, the Eye, and the Arm – Nancy Farmer

Standalone

Set in a futuristic Zimbabwe, three siblings are kidnapped and swept into a dangerous underworld where high-tech crime meets ancient tradition. Their only hope lies in three detectives with extraordinary abilities. Rich in culture, worldbuilding, and adventure, this story blends speculative sci-fi with folklore and family loyalty. Originally written for Teen / YA readers. Heads Up: 15 Stupid, 2 dumb, 4 hell, 2 damn, 2 idiot, 9 Shut Up, 1 God's name in vain, pipe smoking, bullying, witches / spirit Mediums, racism, 1 drug reference. Includes a mystical trance scene involving spirit-channeling, Shona religion brief references to child marriage, and depictions of tribal rituals and substance exposure (all non-graphic).

 🔵 10. The Girl Who Could Fly by Victoria Forester

Series: Piper McCloud, Book 1 of 3 (series complete)

Piper McCloud has a secret: she can fly. When she's sent to a remote facility for gifted children, what begins as wonder and friendship turns into suspicion and control. As Piper uncovers the truth, she must choose between safety and freedom. A blend of sci-fi and fantasy with heart, hope, and high stakes. Originally written for Middle Grade / Teen readers.

Heads Up: Language: 12 stupid, 1 dumb, 2 freak, 5 darn(ed), 3 dang, 6 heck, 1 crap, 1 bejesus, 2 dear/G-d.

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