Horror Manga

Can you guys recommend me some good horror manga?

dead tube, the killer inside

I would recommend something by Sachiko Uguisu


oh! also Ibitsu

Junji Ito's works might be interesting for you to take a look.

alice in the borderland i think, you feel the tension whenever they in the game

Some suggestions off the topic of my head:

Another

Sugiru Juunana no Haru is adapted from a horror-mystery novel written by the wife of the writer of the novel from which Another was adapted. It is not gory at all like Another, and the themes are nothing new in horror, but I was still a fun, short read. (If you read light novels, Shizume no Itaka is of a similar nature as well.)

Shi ni Aruki is similar to Another in concept, but much more of a slowburn and with no gore, only minimal blood.

Higurashi

Umineko no Naku Koro ni is the natural suggestion. The horror element is much weaker than in Higurashi and is mostly overshadowed by the fantasy, mystery and drama, but I think some episodes, especially Ep 2, are still very strong in horror. (Umineko is still usually classified primarily as horror, I think because of association with Higurashi.)

Happy End. is very similar to Higurashi at first, and its influences really show; however, it becomes quite different towards the end.

Higurashi was originally a visual novel before it was adapted as a manga. Its influence is even greater in VNs than in manga, I think, so you may want to expand to this genre for more horror-mystery with a psychological bent

Corpse Party

Dolls Fall is from the same author. Not the best plot in the world, but the gore is very colourful - you can tell the artist had fun drawing it.

Juujika no Rokunin, Kaiju No.8, Jingai Hime-sama, Sweet Home

Anything ito, Homunculus is kinda horror-ish (by the same author of ichi the killer)

crazy man i like it bit ya aynen yle knks ya

[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]Steins;Gate[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Erased[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Death Note[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Hellsing Ultimate[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Mob Psycho 100[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Psycho Pass[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Death Parade[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Tokyo Ghoul[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Elfen Lied[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Claymore[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Shiki[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Devilman: Crybaby[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Akira[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Mardock Scramble[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-K[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Deadman Wonderland[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-King of Thorn[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Gantz[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Kabaneri of the iron Fortress[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Attack on Titan[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Jigoku Shoujo (Hell Girl)[/font]
[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]-Ghost Hunt[/font]