The electronic structure and aromaticityof graphene nanoribbons and carbon nanotubes has been analyzed and color coded. The three distinct classes of aromaticity patterns found for armchair graphene nanoribbons (Kekulé, Clar, incomplete‐Clar, or i‐Clar) are related to the periodicity in the band gap. The appearance of such distinct aromaticity distribution is explained within the framework of the Clar's sextet theory. For more details, see the Full Paper by F. J. Martín‐Martínez et al. on page 6183 ff.