Harvard Professional & Lifelong Learning’s Free Courses catalog offers hundreds of online college-level courses from Harvard University faculties and schools at zero cost to learners worldwide. These free offerings span subjects like literature, data science, public policy, global health, computer science, leadership, humanities, social sciences, and more — all delivered by Harvard faculty and designed for flexible, self-paced online learning. While courses are free to access, optional certificates may be available for a fee for those who want formal recognition. This resource is perfect for lifelong learners, civic educators, researchers, and anyone seeking top-tier academic content from one of the world’s leading universities without tuition barriers.