The fourth-group Noh, so designated because they are performed fourth in a formal five-Noh program, includes almost one hundred plays, and is a group of great variety: some plays are supernatural or visional, others realistic; their leading characters include deities, demons, ghosts, mad people, samurai, and street artists. Dividing them into nine sub-groups, the author fully analyses their dramatic characteristics. Includes translations of four Noh chosen from the first four subgroups. Format is line-by-line translation next to the Romanized Japanese text, with introduction and running commentary.