The Association for Computing Machinery (ACM) does not issue formal invitation letters for visas to attend ACM sponsored conferences. However, ACM is able to provide visa support letters to attendees as well as authors with accepted papers, posters, or members of the conference committee.
For visa support letters, please complete the following request online: https://supportletters.acm.org/. Please allow up to 10 business days to receive a letter. All requests are handled in the order they are received. (More information)