I've not watched many animes but I HAVE watched some animes which define the dark. Here's the list of animes which define the word 'Dark' itself. You can say they are manifestation of darkness themselves.
Another is an anime based upon the Novel and Manga of the same name by Yukito Ayatsuji. There also exists a live action movie based on the novel.
Almost after every episode someone dies, in a dark way.
Sad atmosphere, dead feelings & immense mid-scene horror images and cool sound FX... This is the darkest anime I've ever watched in my whole life and I can bet there isn't any more darker anime than this one. - dhruvchauhan1333
I Love this story how many times I repeat it
2 Attack on Titan
Attack on Titan, also known as Shingeki no Kyojin in Japanese, created by Hajime Isayama, is one of the most popular Japanese anime series to be released. It was first watched in Japan during 2013 and was dubbed in English to be watched in America in 2014. It is best known for its emotional moments, ...read more.
Not dark, more like emotional.
Not much to say about this one. Just... Watch it! - dhruvchauhan1333
I was literallyl
3 Mirai Nikki
Future Diary is a Japanese manga series written and illustrated by Sakae Esuno. It depicts a battle royale in which each combatant has a diary with entries from the future.
I have so much to say about this show, but only the 10% that see this will read, so no point is given. I'll just say..good luck if you're planning on watching.
Ah... This pick is a perfect mixture of dark within action. It's a must-see. It defines two-sided personality of a girl & consists truly sad fates of the heroes. - dhruvchauhan1333
I saw the first six episodes of this anime, and I gotta say. I never thought they would be able to make texts seem scaring.
Definitely one of the darkest shows out there. - Elric-san
4 Ergo Proxy
Ergo Proxy is a science fiction suspense anime television series, produced by Manglobe, directed by Shukō Murase and written by Dai Satō.
Berserk, also known as Sword-Wind Chronicle Berserk, is a Japanese anime television series that aired from 1997 to 1998. An adaptation of the manga Berserk, it comprises 25 half-hour episodes produced by Oriental Light and Magic and first aired on Nippon TV.
Darkest shxt ever
This is by far the darkest series I've ever seen
Why is this not higher, its very dark.
Berserk deserves so much higher
6 Death Note
Death Note is a Japanese television drama series based on the manga series of the same name by Tsugumi Ohba and Takeshi Obata.
The show is centered around Light Yagami a promising highschooler and aspiring detective with a strong sense of "justice".
Best anime on Earth by far
This show is emo, not 'dark'. Plus it's really, REALLY bad. - Brobusky
Yeah, death note fans, I know it deserves a higher place but this list is made for 'Dark' O.O anime. No doubt, this epic anime is dark but the formers are more. This is a must-see foo. - dhruvchauhan1333
7 Elfen Lied
Elfen Lied is a Japanese manga series written and illustrated by Lynn Okamoto. It was originally serialized in Shueisha's Weekly Young Jump from June 2002 to August 2005, with the 107 chapters collected into twelve tankōbon volumes.
Elfen lied was very dark but was very depressing at the end. If you like dark anime that are sad this one is probably the best one. The manga goes really far into the story and by far the manga's ending was more sad than anime.
"An amazing show, dark, gory and sad, this show doesn't leave out or hide from the dark"
8 Serial Experiments Lain
Serial Experiments Lain is an avant-garde anime series directed by Ryutaro Nakamura, with character design by Yoshitoshi ABe, screenplay written by Chiaki J. Konaka, and produced by Yasuyuki Ueda for Triangle Staff. It was broadcast on TV Tokyo from July to September 1998. The series is influenced by ...read more.
9 Midori: Shoujo Tsubaki
11 Corpse Party
! Even the name gives it away. This series is wonderfully dark and twisted. It deserves to be much higher on the list, in my opinion.
Why isn't this higher?!
12 Neon Genesis Evangelion
Neon Genesis Evangelion, commonly referred to as Evangelion or Eva, is a Japanese animated television series produced by Gainax and Tatsunoko Production, and directed by Hideaki Anno.
13 Higurashi When They Cry
AHHH BESIDES GORE AND ALL, THIS IS SUCH A DARK ANIME! The plot twists and yanderes and paranoia in this anime make it the darkest of all time, for sure!
This is a sad anime �" My favorite was mion
14 Perfect Blue
15 Psycho Pass
16 Shinsekai Yori
Not many people have actually seen this anime which is why I think it's so low on the list, In my opnion this one one of the darkest animes out there, After watching this it really messed me up emotionally for awhile. If you have not seen this yet it is seriously a MUST watch.
Pokémon, abbreviated from the Japanese title of Pocket Monsters and currently advertised in English as Pokémon: The Series, is a Japanese anime television series, which has been adapted for the international television markets.
Should be higher
What idiot put this on the list?!
Just 4 de lolz
18 Tokyo Ghoul
Tokyo Ghoul is a Japanese dark fantasy manga series written and illustrated by Sui Ishida. It was serialized in Shueisha's seinen manga magazine Weekly Young Jump between September 2011 and September 2014, and it has been collected in fourteen tankōbon volumes as of August 2014.
This deserves to be in the top 5. The plot is so amazing that it literally questions basic idea of what's good or evil.
19 Puella Magi Madoka Magica
Puella Magi Madoka Magica is a 2011 Japanese anime television series produced by Shaft and Aniplex, directed by Akiyuki Shinbo, written by Gen Urobuchi, music by Yuki Kajiura, opening sang by ClariS, ending by Kalafina (sometimes by the seiyuus) and original characters by Ume Aoki. It also has 3 movies, ...read more.
This should be higher. - FluffyBanana
This series will BREAK YOU.
That's a guarantee.
20 Black Butler
Black Butler is a Japanese anime television series produced by A-1 Pictures and premiered in October, 2008.
This anime should be before Tokyo ghoul its much darker in its own way.
Pretty dark in my opinion
Monster (Japanese: モンスター Hepburn: Monsutā, sometimes referred to as "Naoki Urasawa's Monster") is a Japanese manga series written and illustrated by Naoki Urasawa. Monster has been critically acclaimed, with the manga having won several awards and its anime adaptation being called one of ...read more.
22 Boku No Pico
Boku no Pico is an anime series of three OVA episodes created by Katsuhiko Takayama. It was released to DVD on September 17, 2006.
so dark - Not_A_Weeaboo
23 Deadman Wonderland
Deadman Wonderland is a Japanese manga series written by Jinsei Kataoka and illustrated by Kazuma Kondou, who also wrote and illustrated the Eureka Seven manga, and published in Shōnen Ace since 2008.
Blood, death, gore, and a theme park full of criminals. Oh, and the theme park is controlled by a psychopath. No further explanation needed.
It's probably more dark than Attack on Titan and Tokyo Ghoul. - ModernSpongeBobSucks
24 Fate / Zero
Spoiler alert! Second half is pretty dark considering how light-hearted and sweet Fate Stay Night was.Watched the second half in one go.Please! don't make the same mistake!
25 Danganronpa: Trigger Happy Havoc
26 Akame Ga Kill
Akame ga Kill! (アカメが斬る!, Akame ga Kiru! is a manga published in Gangan Joker authored by Takahiro and Tashiro Tetsuya. It received an anime adaptation that premiered on July 6, 2014 and ended on December 14, 2014.
The first episode starts out fairly lighthearted...until it suddenly takes a 180 and becomes really dark. It's amazing how lighthearted this show can be one moment and EXTREMELY dark the next.
27 Death Parade
Death Parade is a 2015 Japanese anime television series created, written, and directed by Yuzuru Tachikawa and produced by Madhouse.
28 Naruto Shippuden
Naruto: Shippuden is the ongoing sequel to the original Naruto anime and covers the Naruto manga from volume twenty-eight on. The TV adaptation of Naruto: Shippuden debuted in Japan on February 15, 2007 on TV Tokyo. It is developed by Studio Pierrot and directed by Hayato Date.
29 The Promised Neverland
I'm not going to spoil anything. Just watch the first episode yourself.
BEST ANIME EVER!
30 Darker Than Black
Darker than Black, known in Japan as Darker than Black: The Black Contractor, is an anime television series created, directed and written by Tensai Okamura and animated by Bones. In 2007, the 26 episode anime named Darker Than Black: The Black Contractor aired with a huge commercial success. It was ...read more.
31 Paranoia Agent
Paranoia Agent is a Japanese anime television series created by director Satoshi Kon and produced by Madhouse about a social phenomenon in Musashino, Tokyo caused by a juvenile serial assailant named Lil' Slugger.
It's kind of in the name. You get to watch as the main character slowly turns from innocent animator to paranoid victim. Also, the town also turns paranoid, too because of Shounen Batto (Lil slugger). It's very very dark. Don't believe me? Just watch the opening and you'll know what I mean!
32 God Eater
God Eater is an anime adaptation of the God Eater video game series. It is animated by Ufotable and began airing on July 12, 2015 after a one-week delay.
I swear, this was probably one of the darkest anime of 2015. My God, the flashbacks to Soma's violent birth CREEPED the hell out of me! - ModernSpongeBobSucks
33 Corpse Princess
There's no happy moments at all in this anime. - Nonpointed
34 Re:Zero Kara Hajimeru Isekai Seikatsu
Insanely dark but still a bad anime in my opinion. Don't get me wrong, I actually like a lot of dark anime but this isn't one of those I like. - SelfDestruct
35 Barefoot Gen
You think Barefoot's Gen atomic bomb scene is scary? That's NOTHING when compared to Pikadon. The Barefoot Gen Scene is pretty scary, but Pikadon is HORRIFYING. There is more graphic and crude images than Barefoot Gen.
That Atomic Bomb scene will haunt me forever.
37 Black Bullet
Between the borderline racism or pure abuse these young girls go through you never get a break from the pure sadness and hopelessness humanity faces
38 Devilman Crybaby
39 Gurren Lagann
Gurren Lagann, known in Japan as Tengen Toppa Gurren Lagann, is an anime series animated by Gainax and co-produced by Aniplex and Konami. It was also directed by Hiroyuki Imaishi and written by veteran playwright Kazuki Nakashima.
Of all anime, how is Gurren Lagann even dark?! It's actually quite fun and inspirational actually! Although there were some dark moments... - ModernSpongeBobSucks
This was by far the darkest anime ever to exist, the characters can rape the universe and eff a galaxy with one hand.
Wrong adjective! Gurren Lagann is the most EPIC anime ever to exist. I love Gurren Lagann, but it is in no way a dark anime! It's like saying SpongeBob SquarePants is the darkest cartoon ever. - ModernSpongeBobSucks
40 Dragon Ball Z
Dragon Ball Z is a Japanese anime television series produced by Toei Animation. Dragon Ball Z follows the adventures of Goku who, along with the Z Warriors, defends the Earth against evil. The action adventures are entertaining and reinforce the concept of good versus evil. Dragon Ball Z teaches valuable ...read more.
41 Cat Soup
42 Magical Girl Raising Project
I'm reading the light novels this is based off of, so far it's basically Hunger Games as a magical girl anime. - SailorSedna
Episode 1: it's so cute!
Episode 3: what!?!
Episode 12: They're all dead. Oh well, time to start cutting.
43 Tenchi Muyo in Love!
44 Ringing Bell
45 Hunter X Hunter
Hunter × Hunter is a manga franchise created by Yoshihiro Togashi. In 1999, Hunter × Hunter was adapted into a 62-episode anime television series produced by Nippon Animation and directed by Kazuhiro Furuhashi. The show premiered on Japan's Fuji TV and ran until 2001. Three separate original video ...read more.
46 Fullmetal Alchemist
Fullmetal Alchemist is an anime series adapted from the manga of the same name by Hiromu Arakawa. It is about two brothers, Edward Elric and Alphonse Elric, trying to restore their bodies after failing at bringing their mother back to life. It aired in 2003 and was remade as Full Metal Alchemist Brotherhood ...read more.
47 Angels of Death
48 Made in Abyss
49 Seraph of the End
Seraph of the End (Japanese: 終わりのセラフ Hepburn: Owari no Serafu) (also known as Seraph of the End: Vampire Reign) is a Japanese dark fantasy manga series written by Takaya Kagami and illustrated by Yamato Yamamoto with storyboards by Daisuke Furuya. It is published by Shueisha on Jump SQ ...read more.
50 Terror in Resonance