Jabberwocky is a nonsense poem written by Lewis Carroll about the killing of a creature named "the Jabberwock". It was included in his 1871 novel Through the Looking-Glass, the sequel to Alices Adventures in Wonderland. The poem is considered one of the greatest nonsense poems written in English, and its playful, whimsical language has given us nonsense words, portmanteau words, and neologisms such as "galumphing" and "chortle".

The Jabberwock is a creature from the wonderful but wacky mind of Lewis Carroll, the author of the well-known Alice In Wonderland and its sequel Through the Looking Glass and What Alice Found There. The Jabberwock itself may or may not be based on the local Sunderland area legend of the Lambton Worm, seeing as Lewis Carroll was writing the poem "Jabberwocky" while he was visiting some relatives that lived near Sunderland.

In terms of definition, Jabberwocky is a playful imitation of language consisting of invented, meaningless words; nonsense; gibberish.