Csák was the name of a gens (Latin for "clan"; nemzetség in Hungarian) in the Kingdom of Hungary.

The Gesta Hunnorum et Hungarorum ("Deeds of the Huns and Hungarians") records that the ancestor of the family was Szabolcs, son of chieftain Előd, the leader of one of the seven Magyar tribes.

[1][2] The gens divided into 12 branches and several families in the course of the centuries.

The Csáky de Mihály family also belongs to the Csák gens.

[2] The numbering means within the branch.