  The edge physics of graphene based systems is well known to be highly
sensitive to the atomic structure at the boundary, with localized zero mode
edge states found only on the zigzag type termination of the lattice. Here we
demonstrate that the graphene twist bilayer supports an additional class of
edge states, that (i) are found for all edge geometries and thus are robust
against edge roughness, (ii) occur at energies coinciding with twist induced
van Hove singularities in the bulk and (iii) possess an electron density
strongly modulated by the moir\'e lattice. Interestingly, these "moir\'e edge
states" exist only for certain lattice commensurations and thus the edge
physics of the twist bilayer is, in dramatic contrast to that of the bulk, not
uniquely determined by the twist angle.
