Membership of the IIBC is open to the following:
1. Full Membership: For Womens, Mens and unified National Bowling Associations.
2. Associate Membership: For National Associations without a standard indoor green.
3. Affiliate Membership: For any properly constituted body which has a direct involvement in the sport of indoor bowls i.e. Sports Associations, Leisure providers.
The IIBC welcomes applications for all 3 classes of Membership.
Currently the constituent Member Nations are:
Isle of Man