Best harem anime
Ouran High School Host Club (2006) leads the harem list, with a community score of 8.2, ahead of Clannad. The 40 shows span 2001 to 2021, and 2 of them came out in the last five years. 36 of them carry the AniList tag "Female Harem". Most are also comedy, romance, and harem. The typical series runs 12 episodes. Ranked by how plainly each story is built on harem, then community score and popularity. Each entry says what it was matched on.
Ouran High School Host Club
Why it fits: AniList tag: Male Harem
Clannad
Why it fits: AniList tag: Female Harem
Kamisama Kiss: Season 2
Why it fits: AniList tag: Male Harem
Nisemonogatari
Why it fits: AniList tag: Female Harem
Is It Wrong to Try to Pick Up Girls in a Dungeon?
Why it fits: AniList tag: Female Harem
Mushoku Tensei: Jobless Reincarnation
Why it fits: AniList tag: Female Harem
That Time I Got Reincarnated as a Slime 2
Why it fits: AniList tag: Female Harem
Nisekoi: False Love
Why it fits: AniList tag: Female Harem
Classroom of the Elite
Why it fits: AniList tag: Female Harem
The World God Only Knows
Why it fits: AniList tag: Female Harem
High School DxD
Why it fits: AniList tag: Female Harem; synopsis mentions “harem”
A Certain Magical Index
Why it fits: AniList tag: Female Harem
Baka & Test - Summon the Beasts
Why it fits: AniList tag: Female Harem
Haganai: I don't have many friends
Why it fits: AniList tag: Female Harem
Date A Live
Why it fits: AniList tag: Female Harem
Fruits Basket
Why it fits: AniList tag: Male Harem
Is This a Zombie?
Why it fits: AniList tag: Female Harem
The Familiar of Zero
Why it fits: AniList tag: Female Harem
Saekano: How to Raise a Boring Girlfriend
Why it fits: AniList tag: Female Harem
Oreimo
Why it fits: AniList tag: Female Harem
The Quintessential Quintuplets
Why it fits: AniList tag: Female Harem
Black Bullet
Why it fits: AniList tag: Female Harem
Sayonara
Why it fits: AniList tag: Female Harem
Trinity Seven
Why it fits: AniList tag: Female Harem
The Fruit of Grisaia
Why it fits: AniList tag: Female Harem
Dusk Maiden of Amnesia
Why it fits: AniList tag: Female Harem
Monster Musume: Everyday Life with Monster Girls
Why it fits: AniList tag: Female Harem; synopsis mentions “harem”
The "Hentai" Prince and the Stony Cat.
Why it fits: AniList tag: Female Harem
Heaven's Lost Property
Why it fits: AniList tag: Female Harem
Mayo Chiki!
Why it fits: AniList tag: Female Harem
D-Frag!
Why it fits: AniList tag: Female Harem
Strike the Blood
Why it fits: AniList tag: Female Harem
To LOVE Ru
Why it fits: AniList tag: Female Harem
The Eden of Grisaia
Why it fits: AniList tag: Female Harem
Rosario + Vampire
Why it fits: AniList tag: Female Harem
Yona of the Dawn OVA
Why it fits: AniList tag: Male Harem
Masamune-kun's Revenge
Why it fits: AniList tag: Female Harem
Kanon (2006)
Why it fits: AniList tag: Female Harem
My Mental Choices Are Completely Interfering With My School Romantic Comedy
Why it fits: AniList tag: Female Harem
KONOSUBA -God's Blessings On This Wonderful Choker!
Why it fits: AniList tag: Female Harem
Questions about harem anime
What is the best harem anime?
By AniVids' ranking, Ouran High School Host Club comes first, followed by Clannad and Kamisama Kiss: Season 2.
What are the newest and oldest harem anime on this list?
The newest is That Time I Got Reincarnated as a Slime 2 (2021) and the oldest is Fruits Basket (2001).
How many harem anime are there?
AniVids has 258 harem titles that match (counting each season, movie and special), and 213 separate franchises where it is plainly central. This page lists the best 40.