Hiden

or simply "secret" techniques are passed down orally from generation to generation in certain regions or clans.

The groups possessing these techniques are usually extremely secretive about them in order to ensure that no one other than the members of the group or clan learn them as such they are passed down orally instead of written down or recorded. A few hiden techniques require a special ability or lineage and as such are usually the pride and fame of the clan that possesses them. The Nara clan's Shadow Imitation Technique and the Aburame clan's Parasitic Destruction Insect Technique are some examples of this. These technique also cannot be copied through any means of simple observation.

Trivia

 * They are not to be confused with kekkei genkai, a technique that require a specific genetic ability, as technically, hiden techniques can be taught to anyone.
 * Chōza once stated that the Yamanaka clan had mastered hiden techniques. None of the Yamanaka's techniques are currently known to be hiden, and in fact it had been previously stated that the Yamanaka clan's techniques weren't secret techniques.