Below is a list of the vast amounts of crossover groups pertaining to a certain series. Here, you can find your favorite crossovers!

A
Animal Crossing Crossovers 
Ace Attorney crossovers 

B
Basara Crossovers 
Bastion crossovers 
Battlestar Galactica
The Foreign Army (Also Bleach Crossovers)
Bionicle Crossovers 
Borderlands & Borderlands 2 Crossovers 

C
Call of Duty Crossovers 
Cave Story Crossovers 
Chroma Crossovers 

D
Dangan Ronpa Crossovers 
Destiny Crossovers 
Doctor Whooves crossovers 
Digimon Crossovers 

F
Fallout
Fossil fighters crossovers

H
Halo and Ponies 
Happy Tree Friends Crossovers  
Harry Potter Crossovers

J
Jak and Daxter crossovers 

K
kerbal space crossovers 
Kill La Kill
Kingdom Hearts Crossovers

L
Lego
Lost Planet crossovers 

M
Mario Crossovers 
Marvel Crossovers
Metroid Crossovers
Minecraft Crossovers 
Monster Hunter crossovers 

N
Crossovers With Naruto

O
One Piece Crossovers 

P
Pacific Rim Crossovers 
Pokemon fics

S
Shadow of the Collosus crossovers 
Sonic Crossovers 
Star Wars
King-Overs (Stephen King Crossovers) 
Spyro Crossovers 
Supernatural Crossovers 

T
The Land Before Time Crossovers
Totally Spies Crossovers  
Transformers Crossovers
Treasure Planet Crossovers 
TRON Crossovers 

W
Warrior Crossovers 
wizard101 crossovers 

X
Xiaolin Showdown & Xiaolin Chronicles Crossovers 

Z
Zelda Crossovers

Don’t see the crossover group you’re looking for? Either it exists and we haven’t found it yet, or the group for it hasn’t been created yet. If the former, feel free to direct me to it down below in the comments section. If the latter, make the group yourself and then show me so I can post it!
(When providing a group, it is prefered if you have the name of your group already coded in with a link so I can easily copy and paste it into the list. ex: Halo and Ponies)
(If a group up above has a lower quality or member count than an already existing group for a series, please tell me so I can switch it out)

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3238422
On my mobile, so it's hard to grab a link. Sorry.

You forgot the Hero Factory crossover group.

In the words of Detective Drycoff, "that's a big list."

Wait, we have Bionicle?
...
THE NOSTALGIA RETURNS

Pokemon please?

3238422 Lego if possible

3273062
3273073

Added.

3273486

3238422 Where is 'Friday the 13th' and '(Terror on)Elmstreet*

3238422 The Library of Lovecraftian and Lovecraft-inspired Fiction

3302463

A little stuck here. Would lovecraft be under 'H' for H.P. Lovecraft or 'L'?

3317115 It would be under 'C' for Cthulhu.

Seriously, probably L for Lovecraft

There's a Metal Gear Crossover Group, but it seems to have bit the bullet as it were.

3238422 you forgot Yugioh!

3238422

S...Supernatural

3238422

Heres the Mojave Express (for regular fallout crossovers)

There's a Full Metal Alchemist crossover too. i'll give the link: The Fullmetal Human: The Making Of Friendship

I found two Battlestar Galactica x-over fics.
And here is the Group I just created for any such fics:
Battlestar Galactica

No Guilty Gear Crossovers? Q_Q Too sad u_u

What about Hellsing???

3354516

Tactical Espionage Action? :3

Has anyone ever thought of doing a Monster High crossover

3238422 I run a Kill la Kill group which is home to a few stories, dunno if that pertains to this list.

link

4289076
It's perfect.

Hey, they finally made a Jojo's and and 2 BlazBlue Crossover fics, WHY this list is not updated?

You seriously don't have Dragon Ball up there?

Frieza calls blasphemy!

Changed title to Crossover Series Directory from Series Listings.

4501749
This thread is a directory to existing crossover groups specializing on a certain series. We don't make them.

If you'd like, you can make groups for those two so I can include them up here on the list.

If they already exist, I can only apologize for my lack of knowledge. FIMfiction is too big for me to constantly scour for new groups that have been recently created. As always however, you can reply to me their URL so that I can hyperlink it into the above list.

4657333

The BlazBlue crossovers alreado exist, there are 2 fanfics .-.

3238422 Where's the Star Wars group?

4658755
4658797

If they already exist, I can only apologize for my lack of knowledge. FIMfiction is too big for me to constantly scour for new groups that have been recently created. As always however, you can reply to me their URL so that I can hyperlink it into the above list.

edit: I checked for a Blazblue group and couldn't find one.

4658802 Ok, here you go.

4658806
Thank you! I'll put it up right away.

daaaaamn das a lot

4658802

Because there are not group for many of the fanfics, and BTW, these are the fanfics, you're welcome .-.

http://www.fimfiction.net/stories/relevance?search=BlazBlue-+Equestria+Shift

http://www.fimfiction.net/stories/relevance?search=Assist+me%21%21++Princess+Luna%21

4659357
Sorta confused what you're asking of me now, but thanks for the fics.
4658819
Hi Discordia.

4659647

I decided to create the group, and I'll try to add the fictions I mentioned before.

https://www.fimfiction.net/group/208837/asw-guilty-gear-andor-blazblue-x-mlp

The Group is about Guilty Gear (G) and BlazBlue (B) Crossovers with MLP

I created a group for Yugioh Crossovers in case anyone's interested.

3238422

Here is one for Final Fantasy

https://www.fimfiction.net/group/199867/final-fantasyxequestria

How about a Kim Possible crossover with MLP: Equestria Girls?
I've started such a story and I'm VERY new to the site so I'm not sure about how to go get it posted for everyone to read.

Still NO UPDATE to this list?

Has anyone thought of a Doom/Mlp cross? I think it's be interesting.

A little disappointed that there's no Jojo's Bizarre Adventure crossover group, but that's an easy fix. I'll either start one up myself, or laze around and wait for someone else to make one.

3273486 I'm interested in How to train your dragon, Transformers: Robots in Disguise 2015 crossovers.

3238422 I just created a Jojo's Bizarre Adventure crossover group. Here's a link to it.

https://www.fimfiction.net/group/211629/jojos-bizarre-adventure

Damn, this seriously needs an update

this needs an update, and 3238422 I just created a Dying Light Crossover Group. Here's a link https://www.fimfiction.net/group/212121/dying-light-crossover

I'm more or less surprised that you don't have He Man, and the Masters of the Universe on this list. And I mean the original He-Man, the 1983 version. But I guess the fact that it's a little older than your other listings answers my own question as to why.

...I guess what I'm trying to say is, if a certain someone did come up with a He-Man crossover, would it be reasonable to request it on your listing?

How about one for Godzilla