Password Protect a Word Document

*"Password Protect a Word Document"*

Word menu --> Preferences --> Security

This info is already available to you from Word's own built in Help files.

Create your own secure disk image for a file. Go to Disk Utility, file and new blank disk image. Fill out volume size and name and then it will ask for password etc.

Dick

Then it would have been nice if you would have mentioned that. The title of your post clearly suggests you're using Word.

in general, there is no way to password protect single files in OS X (there are some exceptions to that like pdf documents). you can change permissions on the file so only the current user has access to it. if that's not enough, you can save it inside an encrypted disk image as was already mentioned.