Is there a tourist office at Charles de Gaulle airport and If there is where is it located?
There is no tourist office but there are Aeroports de Paris Information desks in each terminal. (ADP) The employees there can help you with info on how to get to your hotel & where to buy tickets., etc. Proper tourist info centres are at the Gare du Nord, the Gare de Lyon, plus many other locations and you can find them if you google "tourist information offices paris".
Helen - What are you looking for? There are tourist information offices at CDG that can sell museum passes.