Monogatari (物語?) is a literary form in traditional Japanese literature, an extended prose narrative tale comparable to the epic. Monogatari is closely tied to aspects of the oral tradition, and almost always relates a fictional or fictionalized story, even when retelling a historical event. Many of the great works of Japanese fiction, such as the Genji monogatari and the Heike monogatari are in this monogatari form.

The form was prominent around the 9th to 15th centuries, reaching a peak between the 10th and 11th centuries. According to the Fūyō Wakashū (1271), at least 198 monogatari existed by the 13th century. Of these, around forty still exist.

When European and other foreign literature later became known to Japan, the word "monogatari" began to be used in Japanese titles of foreign works of a similar nature. For example, A Tale of Two Cities is known as Nito Monogatari (二都物語), One Thousand and One Nights as Sen'ichiya Monogatari (千一夜物語) and more recently The Lord of the Rings as Yubiwa Monogatari (指輪物語).