Dihedral or polyhedral may refer to:
Dihedral angle, the angle between two mathematical planes Dihedral (aeronautics), the upward angle of a fixed-wing aircraft's wings where they meet at the fuselage, dihedral effect of an aircraft, longitudinal dihedral angle of a fixed-wing aircraft Dihedral group, the group of symmetries of the n-sided polygon in abstract algebra Also Dihedral symmetry in three dimensions Dihedral kite, also known as a bowed kite Dihedral doors, also known as butterfly doors Dihedral prime, also known as a dihedral calculator prime In rock climbing, an inside corner of rock
See also Anhedral (disambiguation) Euhedral, a crystal structure Polyhedron, a geometric shape