Ivan the Fool is an opera-fairytale for children in three tableaux, by César Cui, composed in 1913. The libretto was written by Nadezhda Nikolaevna Dolomanova, using Russian folk tales. (It is not derived from Leo Tolstoy's story of the same name.)

The title can be rendered in English in a number of ways, depending upon whether one wishes to consider the diminutives involved: Foolish Ivan, Ivan the Little Fool, Johnny the Little Fool, etc.

The performance history of this opera has yet to be traced.