I was a rapporteur of the main session of an intergovernmental forum, should I add the final report as a publication in my CV? I was an intern at an intergovernmental organization, during an international forum I reported the first and main panel, should I add the final report in my CV as a publication? 
The final report's bibliography has: the organization's name, date, forum name. Within the report there is the list of the editors and then the rapporteurs were my name is listed. However, as I did not participate to edit the report I hesitate to add it. What do you think?
You should ask the organization specifically what is appropriate. It might be fine, but I know of other such international collaborations in which it is specifically forbidden to claim authorship. The work is attributed to the committee as a whole, by name. 

An additional reason for not doing this is the question as to whether it is a creative work on your part. I can't judge, of course, but it seems unlikely. 

You can, of course, include your participation elsewhere in the CV.