Whatever is in the parenthesis is how many spots are available for that clan.

Aburame(Unlimited)
Hidden Village: Konoha Village
Classification: Clan
Member Appearances: Aburame Shino, Aburame Shibi
Signature Abilities: Kikaichuu no Jutsu

This clan from Konoha Village is known for its ties to insect. At birth clan members form an agreement with bugs to inhabit and feed on the chakra their body creates. In return the bugs will serve the commands of the clan member.

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Akimichi(Unlimited)
Hidden Village: Konoha Village
Classification: Clan
Member Appearances: Akimichi Choji, Akimichi Chouza
Signature Abilities: Baika no Jutsu

This clan from Konoha Village is known for its ability to modify the size of its body, increasing their mass to a large spherical ball. In this form it is difficult for the clan user to take physical damage.

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Fuuma(Unlimited)
Location: Rice Field Country
Classification: Clan
Member Appearances: Fuuma Arashi, Fuuma Hanzaki, Fuuma Sasame, Fuuma Jigumo, Fuuma Kagerou, Fuuma Kamakiri
Signature Abilities: Chakra no Ito

Years previously Orochimaru came to the Rice Field Country to establish Hidden Sound. The Fuuma clan had been in rough times since a previous war with the Gold and Silver Country. Many of the Fuuma Clan shinobi thus decided to volunteer and join Orochimaru's new army on the promise he could make their clan powerful once again.

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Haku(3)
Hidden Village: Mist Village
Classification: Bloodline
Member Appearances: Haku, Haku's Mother
Signature Abilities: Makyou Hyoushou

This clan from Mist Village was known for its ability to manipulate water into forms of ice.

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Hyuuga(2)
Hidden Village: Konoha Village
Classification: Bloodline
Member Appearances: Hyuuga Neji, Hyuuga Hinata, Hyuuga Hizashi, Hyuuga Hiashi, Hyuuga Hanabi
Signature Abilities: Byakugan

This clan from Konoha Village is known for its ability to visualize the chakra pathways, or tenketsu, of their opponent. Using this techinque in conjunction with taijutsu techniques, they can forceably close their opponents chakra points so the victim can no longer use their chakra.

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Inuzuka(Unlimited)
Hidden Village: Konoha Village
Classification: Clan
Member Appearances: Inuzuka Kiba, Inuzuka Tsume, Inuzuka Hana
Signature Abilities: Shikyaku no Jutsu

This clan from Konoha Village is known for its ties to the canine species. Many members have a canine familiar who acts as a partner to the clan member. Also clan members can use jutsus to take on canine-like abilities.

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Kaguya(4)
Hidden Village: Mist Village
Classification: Bloodline
Member Appearances: Kaguya Kimimaro
Signature Abilities: Shikotsu Myaku

The Kaguya clan hailed from Hidden Mist and they were known for their love of battle. They foolishly decided to challenge their home country and they were all wiped out save for Kimimaro. This clan has the ability to manipulate their bone structure, this ability is called Shikotsu Myaku (Corpse Bone Pathways). They can remove their bones at will to create weapons as strong as steel and also use their abilty to spurn the creation of new bones.

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Nara(Unlimited)
Hidden Village: Konoha Village
Classification: Clan
Member Appearances: Nara Shikamaru, Nara Shikaku, Nara Yoshino
Signature Abilities: Kagemane no Jutsu, Kage Kubi Shibari no Jutsu

This clan from Konoha Village is known for its ability to manipulate their shadow. Utilizing this ability the clan member can attach their shadow to the shadow of another individual, and then take control of the user. Resulting in the affected person replicating or "shadowing" the exact movements in mirror form of the clan member.

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Sakon Ukon (4)
Hidden Village: Sound Village
Classification: Bloodline
Member Appearances: Sakon, Ukon
Signature Abilities: Souma no Kou

Members of the "Four" Sounds, Sakon and Ukon have the ability to manipulate and alter the molecules of their body, this ability is called Souma no Kou (Attack of an Evil Spirit Pair). This grants the brothers the ability to alter their physical characteristics.

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Uchiha(0)
Hidden Village: Konoha Village
Classification: Bloodline
Member Appearances: Uchiha Sasuke, Uchiha Itachi, Uchiha Obito, etc.
Signature Abilities: Sharingan, Mangekyou Sharingan

This clan from Konoha Village is known for its ability to copy Genjutsu, Taijutsu and Ninjutsu and then replicate it at will. Clan members have the ability to alter their eyes to take the form of "Sharingan". With their eyes in this form clan members can copy the movement of those they examine.

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E-caster(3)
Hidden village: Konoha Village
Classification: Bloodline
Member Appearances: None.
Signature Abilitys: Ice element, Fire element, Earth element, Water element.

A clan that has a birth mark in the shape of something elemental such as a wave or a flame, There are four levels of of each element, the first three levels just give control over an element as well as the ability to make the element, until level 4 the first three levels increase control and power over the element, the fourth level can increase the strength of the user as well as increase control and power of the element.