Short answer
Most horror films are not permitted, because they usually include music, indecent scenes, and stories that glorify devils, black magic or mock the religion. The genre is not haram by name, but almost all mainstream horror fails these tests. Scaring yourself for fun is also a waste of the heart that Muslims are told to protect.
Watching what contains music, awrah or indecency is haram, and so is content that celebrates shirk, magic or mocking the religion. A film free of all these is permitted in itself, though filling time with fear and violence is disliked.
The four schools agree on this.
Explanation
Allah says that hearing, sight and the heart will all be questioned, and He praises believers who turn away from idle and harmful talk. The Prophet ﷺ said that part of a person's good Islam is leaving what does not concern him. These principles decide the ruling on any film.
Why horror usually fails:
- Music and sound design: horror relies heavily on music to build fear, which is haram in the Hanafi school.
- Indecency: many horror films include nudity or sexual scenes.
- The occult: possession, demon summoning, Ouija boards, black magic and devil worship are shown as exciting or powerful. Some films even make Quran verses, prayer or religious people the joke.
- Extreme violence: gore for entertainment hardens the heart.
There is also the effect on you. People report nightmares, fear of the dark and anxiety after horror films. Many use them late at night and then miss Fajr. Shaytan gains ground when a heart is full of fear and empty of remembrance.
What is fine: a clean thriller without music or indecency, a documentary, or true stories of the unseen from the Quran and sunnah, which teach rather than entertain with fear. If you watched horror and now feel scared, read Ayat al-Kursi and the last three surahs and follow the steps after a bad dream. For films in general, see is watching anime and movies haram.
The evidence
Quran, Surah Al-Israa 17:36
وَلَا تَقْفُ مَا لَيْسَ لَكَ بِهِۦ عِلْمٌ ۚ إِنَّ ٱلسَّمْعَ وَٱلْبَصَرَ وَٱلْفُؤَادَ كُلُّ أُو۟لَٰٓئِكَ كَانَ عَنْهُ مَسْـُٔولًۭا ﴿٣٦﴾
And do not pursue that of which you have no knowledge. Indeed, the hearing, the sight and the heart - about all those [one] will be questioned.
What we watch and hear will be asked about.
Quran, Surah Al-Muminoon 23:3
وَٱلَّذِينَ هُمْ عَنِ ٱللَّغْوِ مُعْرِضُونَ ﴿٣﴾
And they who turn away from ill speech
Believers turn away from what is useless and harmful.
Jami' at-Tirmidhi 2317
Graded sahih... من حسن إسلام المرء تركه ما لا يعنيه ...
"Part of the excellence of a person's Islam is leaving what does not concern him."
Time spent on harmful entertainment is better left.
Where the ruling is recorded
- Radd al-Muhtar (Ibn Abidin), Kitab al-Hazr wa al-Ibaha. The rulings on looking at awrah and listening to instruments that apply to films.
Checked by our team. For a more accurate answer to your own situation, consult a scholar. Quran translation by Sahih International. Hadith Arabic from the standard editions of the six books and the Muwatta, with gradings as recorded there; the English is our own rendering. Spotted a mistake? Tell us.