Hatt may refer to:

* Hatt, Cornwall - Cornwall coord|50.42|N|04.26|W|region:GB SX3961
* Richard Hatt, a businessman, judge and political figure in Upper Canada
* The Hatt family, fictional characters including The Fat Controller, the head of the railway in The Railway Series of books written by Rev. W. V. Awdry
* High All The Time
* An acronym meaning Help Authoring Tools and Techniques. See Help authoring tool.

See also

* Hat (disambiguation)
* Het (disambiguation)
* Hett (disambiguation)

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