Hatt may refer to:

• Hatt, Cornwall, England
• Hatt Building, on the National Register of Historic Places listings in Napa County, California

• Hatt (surname)
• Arabic خط (ḫaṭṭ: "line, writing"), everyday Arabic handwriting or script in contrast to style and system requirements of calligraphy Cf. ar:خط (توضيح) (Hatt, disambiguation)
  • Hijazi script (خط حجازي ḫaṭṭ ḥiǧāzī).
  • Hatt-i humayun, edict of the Ottoman government (e.g. Hatt-ı Hümayun of 1856)
• Help authoring tools and Techniques, a software program used to create help documents
• The Hatt family, fictional characters including Sir Topham Hatt, The Fat Controller, the head of the railway in The Railway Series of books written by Rev W. V. Awdry

• Hat (disambiguation)
• Hats (disambiguation)
• Het (disambiguation)
• Hett (disambiguation)

This disambiguation page lists articles associated with the title Hatt.
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