A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer between the first electrode and the second electrode, the interlayer including an emission layer, wherein the light-emitting device includes an organometallic compound represented by Formula 1: wherein at least one of R11, R1 in a number of b1, R2 in a number of b2, R3 in a number of b3, or R4 in a number of b4 is a group represented by Formula 1A, and A1 is a group represented by Formula 1B.