The Mistralian norm is a linguistic norm for the Occitan language. It was first used in a published work by Joseph Roumanille in 1853, and then by Frédéric Mistral in 1854. Its aim is to make Provençal Occitan orthography more logical, relying on a mix of traditional spelling and French spelling conventions.

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The Tresor dòu Felibrige, published by the Félibrige in 1878, was written entirely in the Mistralian norm.

Some features include:

• Using the letter o to represent a final [ɔ] or [o], where Classical Occitan uses a. For example, chata becomes chato in the text above.
• Using ou to represent [u], where Classical Occitan uses o. For example, escolan becomes escoulan in the text above.
• Using gn to represent [ɲ], where Classical Occitan uses nh. For example, montanha becomes mountagno.^[1][2]
• Using o to represent [ɔ], where Classical Occitan uses ò. For example, pòrta becomes porto.^[3][4]

The IETF language subtag for the norm is oc-grmistr.^[5]