Autodidacticism (also autodidactism) is self-directed learning that is related to but different from informal learning. In a sense, autodidacticism is "learning on your own" or "by yourself", and an autodidact is a self-teacher. Autodidacticism is a contemplative, absorptive procession. Some autodidacts spend a great deal of time reviewing the resources of libraries and educational websites. One may become an autodidact at nearly any point in one's life. While some may have been informed in a conventional manner in a particular field, they may choose to inform themselves in other, often unrelated areas.

Autodidactism is only one facet of learning, and is usually complemented by learning in formal and informal spaces: from classrooms to other social settings. Many autodidacts seek instruction and guidance from experts, friends, teachers, parents, siblings, and community. Inquiry into autodidacticism has implications for learning theory, educational research, educational philosophy, and educational psychology.