Tiddler may refer to:
A small fish, especially the three-spined stickleback Tiddler, the basic component of a TiddlyWiki
See also Tom Tiddler's Ground, children's game Tom Tiddler's Ground, collaborative work by Charles Dickens Tiddly, a term in barbershop arranging Tittle Tiddler the Story-telling Fish, children's book by Julia Donaldson and Axel Scheffler