Usul

Usul may refer to:

Ideas

 * Usul al-fiqh, the principles of Islamic jurisprudence
 * Usul al-Din, the principles of Islamic religion
 * Usul (music), a rhythmic pattern used in Ottoman classical music.

Characters

 * Usul, the secret tribal name of Paul Atreides in Frank Herbert's Dune novels
 * a species in Neopets