Literary nonsense (or nonsense literature) is a broad categorization of literature that uses sensical and nonsensical elements to defy language conventions or logical reasoning. Even though the most well-known form of literary nonsense is nonsense verse, the genre is present in many forms of literature.

The effect of nonsense is often caused by an excess of meaning, rather than a lack of it. Nonsense is often humorous in nature, although its humor is derived from its nonsensical nature, as opposed to most humor which is funny because it does make sense.