It is surprising to note that there is no option to delete iMessage history in Mac OS X. Apple not being able to understand the importunate value of deleting the history is out of this world. This option is not only important for privacy, it could also give you a lot of free space. One can delete iMessages from the past in iPhone and free up a lot of space, but when it comes to deleting history in Mac OS X, Apple hasn’t been much generous. But still, there is a trick that lets you delete and wipe off iMessage history in your Mac.
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Read more here:: How to Delete Chat History in iMessage in Mac OS X