- Conservation Ontario
- Credit Valley Conservation Authority
- Essex Region Conservation Authority
- Nature Conservancy of Canada – Ontario Region
- Ontario Heritage Trust
- Rideau Valley Conservation Authority
- St. Clair Conservation Authority
- South Nation Conservation Authority
- Toronto and Region Conservation Authority
- Upper Thames River Conservation Authority
An Associate must be a non-profit corporation and have in its objects the protection and conservation of natural and cultural heritage areas. This group includes conservation authorities, national land trusts and municipalities. Associate is a supporter category.
Associate charities are encouraged, but not obliged, to adopt the Canadian Land Trust Standards and Practices as the technical and ethical guidelines for their organizations land securement and stewardship activities.