Embodiments provide a composition including a heterocyclic compound, a light-emitting device, and an electronic device including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an interlayer, and a heterocyclic compound. The heterocyclic compound is represented by Formula 1, which is explained in the specification: