If you are being sent by your government to a meeting or conference which is sponsored by an international organization, you will generally require a G visa, unless your visit will also include other official activities, such as bilateral meetings in Washington D.C. with U.S. Government officials, which would require an A visa. Additionally, a head of state, head of government, cabinet member, presiding officer of a national legislative body, or member of the highest judicial tribunal qualifies for A visa classification to represent his/her government at international meetings or conferences which is sponsored by an international organization.