I set my input source to be US English. And the flag showing on the taskbar is also an American flag.

But whenever I type something in Mail.app or Notes.app the spell check still corrects my spelling to British English:

  • e.g. it highlights my "organize" and suggest s"organise".

Please, how to make my Mac (OS X 10.8) an American?


For OS X 10.8:

System Preferences > Languages & Text > Text > Spelling

image of control

Or for OS X 10.9 and later:

System Preferences > Keyboard > Text > Spelling

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To add to what gentmatt said, in the case you need to keep "Automatic by Language" because you happen to write in different languages, click on "Set Up…" in the list shown for the Spelling option.


On the dialog box that appears, you can change the order for the languages. In my case, this is the order I chose.


Now, I can write organize, and the word is not corrected, nor do I get a suggestion for writing organise. (It happens that organise is shown as incorrect.)

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  • and for snow lep? – adolf garlic Mar 25 '13 at 19:13
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    In Mavericks, you can get there via System Preferences -> Keyboard -> Text -> Spelling (or Language & Region -> Keyboard Preferences -> Text -> Spelling). – djc Feb 18 '14 at 10:01
  • Thank you, this one is the answer I was looking for as a non-native English speaker/user. – karni Apr 20 '18 at 16:25

In Mavericks (10.9):

System Preferences -> Keyboard -> Text -> Spelling


System Preferences -> Language & Region -> Keyboard Preferences -> Text -> Spelling

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  • This should be a comment or an edit adding to a previous answer as it is the same just via a different menu route – mmmmmm Nov 25 '13 at 15:46
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    Actually, it was helpful to me having this as a separate answer as the previous answer references the non-existent (in Mavericks) UX path "System Preferences → Languages & Text → Text → Spelling" path. – easyE Sep 10 '14 at 7:47

Autocorrect with multiples languages (automatic by language) in Mavericks is broken. It does not underline all the bad written words. I have to select only 1 language to get it properly working.

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  • Evidence? I'm not finding this to be the case. – Douglas Held Dec 14 '14 at 13:23

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