Usul may refer to:

Ideas

Usul al-fiqh Principles of Islamic jurisprudence () are traditional methodological principles used in Islamic jurisprudence (''fiqh'') for deriving the rulings of Islamic law (''sharia''). Traditional theory of Islamic jurisprudence elaborates how the scri ...

, the principles of Islamic jurisprudence *

Usul al-Din ''Aqidah'' (, , pl. , ) is an Islamic term of Arabic origin that means "creed". It is also called Islamic creed or Islamic theology. ''Aqidah'' goes beyond concise statements of faith and may not be part of an ordinary Muslim's religious ins ...

, the principles of Islamic religion *

Usul (music) {{more citations needed, date=January 2011 In Ottoman classical music, ''usul'' is an underlying rhythmic cycle that complements the melodic rhythm and sometimes helps shape the overall structure of a composition. An usul can be as short as two b ...

, a rhythmic pattern used in Ottoman classical music.

Characters

*Usul, the secret tribal name of

Paul Atreides Paul Atreides (; later known as Paul Muad'Dib, and later still as The Preacher) is a fictional character in the Dune (franchise), ''Dune'' universe created by Frank Herbert. He is a main character in the first two novels in the series, ''Dune ( ...

in Frank Herbert's ''Dune'' novels *a species in

Neopets ''Neopets'' is a free-to-play virtual pet site, virtual pet browser game. First launched in 1999, the game allows users to own virtual pets ("Neopets") and explore a virtual world called "Neopia." Players can earn one of two virtual currency, v ...

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