Creation: An agency relationship is often created by the principal. A fiduciary relationship involves the law imposing duties on a person to act in the interest of another.
Scope: All agency relationships are fiduciary relationships, but not all fiduciary relationships are agency relationships. For example, a trust relationship is a fiduciary relationship, but not an agency relationship. An agency relationship is a fiduciary relationship.
Parties: An agency relationship often involves three parties: the principal, agent, and third parties. A fiduciary relationship often involves two parties.

Highlights on Relationship between a Company and its Directors