Doujinshi (同人誌), also romanized as dōjinshi, is the Japanese term for self-published print works, such as magazines, manga, and novels. Part of a wider category of doujin (self-published) works, doujinshi are often derivative of existing works and created by amateurs, though some professional artists participate in order to publish material outside the regular industry.

A doujinshi convention is a type of event dedicated to the sale of doujinshi, or self-published books. These events are known in Japanese as doujin sokubaikai or doujinshi sokubaikai. Thousands of doujinshi conventions take place in Japan every year. Doujinshi conventions can also be found in some other countries.