To qualify for a G visa the individual concerned must be entering the United States in pursuance of official duties.
G-1 Members of a permanent mission of a recognized government to an international organization.
G-2 Representatives of a recognized government traveling to the United States temporarily to attend meetings of a designated international organization.
G-3 Representatives of non-recognized or non-member governments to an international organization.
G-4 Visas are issued to individual personnel who are proceeding to the United States to take up an appointment at a designated international organization.
G-1, G-2, and G-3 visa applications must be accompanied by a Note Verbale from the applicant’s national government. G-4 visa applications must be accompanied by an official request from the appropriate international organization (the G-4 note must be sent directly by cable to the consular section from the international organization.)
Family members accompanying a G visa holder take the same classification as the principal applicant.