Leo Clubs are a youth organization of Lions Clubs International. As of 2025, Leo Club operates in over 140 countries often collaborating with United Nations over impactful projects.

Leo clubs encourage youths to develop leadership qualities by participating in social service activities. They are dependent on a Lions Club to sponsor and initiate them. Leo Club members are addressed as "Leos."

They conduct various projects in the fields of health care, elders, children, disabled people, literacy and education, and self-development. Leos can raise funds by conducting fund-raising projects. They can conduct projects with other Leo Clubs, sponsoring Lions Clubs, or with outside organizations.

Leo Clubs are sponsored by Lions Clubs and comprise an official program of Lions Clubs International.

There are approximately 7,600 Leo Clubs worldwide with over 200,000 participants.

Leos participate and complete some 60,000 service projects each year.