The companies and organizations that make up IAATO include:
- Members or Associate B1 members: Companies that organize and operate travel programs to the Antarctic themselves,
- Associate B2 members: Tour operators, travel agents or other marketers that book their customers into other Members' or Associate B1 members' Antarctic programs.
- Affiliate members: Companies or organizations with an interest in supporting Antarctic tourism and IAATO objectives, but do not market Antarctica tours.
For a complete listing of current IAATO members, including contact information and websites, follow this link to the Membership Directory.