Can i use a different apple ID on imessage then the one that I use for ITunes?

Hi,

The answer is yes.

In fact in System Preferences > Internet Accounts or iCloud there is no option in the Listings of things that can be linked for Messages, FaceTime, App Store, iTunes, iBooks and other places that you can login to with an Apple ID.

Some pay to be linked to together such as iTunes, The App Store and iBooks that can access the same money/payment arrangement or Messages with the iMessages account and FaceTime as the Messages app can invoke FaceTime from an iMessages conversation and you may want the person to know it is you rather than anther called on another ID they don't know.

Extra.

If the Apple ID happens to be from Apple such as an ID ending in @mac.com or an @me.com one that is linked to iCloud or an @icloud.com one itself it can also be used as an AIM valid Screen Name.

You use the + icon button below the list in the Preferences > Accounts and add it as if it were an AOL account using the full ID and same Apple Password.

AIM/AOL and Apple have a long standing agreement for this dating back to the first edition of iChat more than 10 years ago.

9:08 pm Sunday; January 3, 2016

With Messages open click on the Messages option on the top menu bar. Then on Preferences.

Messages/Add Account and create a new account using your other Apple ID. You can then go to Messages/Preferences/Accounts and uncheck enable this account for the iTunes ID.