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"Alien entities" is a genre label for books that center on encounters with nonhuman intelligences—whether extraterrestrial life forms, interdimensional beings, ancient cosmic entities, or mysterious sentient forces—and the consequences of those encounters. These works explore the biology, culture, motives, and incomprehensibility of "the other," using first contact, invasion, possession, or cohabitation as a lens to examine themes like otherness, communication barriers, ethical dilemmas, identity, and humanity’s place in the universe. Tone can range from wonder and adventure (space opera and first-contact science fiction) to uncanny dread and existential horror (cosmic horror and weird fiction), and the category spans hard science speculation, speculative fantasy, thrillers, and literary explorations of alienness. Readers choosing this category expect imaginative worldbuilding, encounters that challenge human assumptions, and narratives that probe both the alien mind and human reactions to it.

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