An organometallic compound represented by Formula 1 or Formula 2: wherein, in Formula 1 and Formula 2, X 1 to X 4 and X 11 to X 16 are each independently a carbon atom or a nitrogen atom, A1 to A4 and B1 to B6 are each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms for forming a ring, at least one selected from A1 to A4, and at least one selected from B1 to B6, are a substituted or unsubstituted borazine group, R 1 to R 4 and R 11 to R 16 are each independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms for forming a ring, and any of R 1 to R 4 and R 11 to R 16 are optionally combined with an adjacent group to form a ring, a1 to a4 and a11 to a16 are each independently an integer of 0 to 3, L 1 to L 3 and L 11 to L 16 are each independently a direct linkage, ∗-O-∗, ∗-S-∗, a substituted or unsubstituted divalent alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group having 1 to 30 carbon atoms for forming a ring, b1 to b3 and b11 to b16 are each independently 0 or 1, and in Formula 2, B1, B3, and B6 are optionally linked to a linker represented by Formula 2A: wherein, in Formula 2A, L 31 is a nitrogen atom, a substituted or unsubstituted trivalent alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted trivalent aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted trivalent heteroaryl group having 1 to 30 carbon atoms for forming a ring, and c is 0 or 1, wherein "unsubstituted" or "substituted" refers to a group that is unsubstituted or that is substituted with at least one substituent selected from the group consisting of a deuterium atom, a halogen atom, a cyano group, a nitro group, an amino group, a silyl group, an oxy group, a thio group, a sulfinyl group, a sulfonyl group, a carbonyl group, a boron group, a phosphine oxide group, a phosphine sulfide group, an alkyl group, an alkenyl group, an alkoxy group, a hydrocarbon ring group, an aryl group, and a heterocyclic group. X 1 to X 4 and X 11 to X 16 are each independently a carbon atom or a nitrogen atom, A1 to A4 and B1 to B6 are each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms for forming a ring, at least one selected from A1 to A4, and at least one selected from B1 to B6, are a substituted or unsubstituted borazine group, R 1 to R 4 and R 11 to R 16 are each independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms for forming a ring, and any of R 1 to R 4 and R 11 to R 16 are optionally combined with an adjacent group to form a ring, a1 to a4 and a11 to a16 are each independently an integer of 0 to 3, L 1 to L 3 and L 11 to L 16 are each independently a direct linkage, ∗-O-∗, ∗-S-∗, a substituted or unsubstituted divalent alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group having 1 to 30 carbon atoms for forming a ring, b1 to b3 and b11 to b16 are each independently 0 or 1, and in Formula 2, B1, B3, and B6 are optionally linked to a linker represented by Formula 2A: wherein, in Formula 2A, L 31 is a nitrogen atom, a substituted or unsubstituted trivalent alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted trivalent aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted trivalent heteroaryl group having 1 to 30 carbon atoms for forming a ring, and c is 0 or 1, wherein "unsubstituted" or "substituted" refers to a group that is unsubstituted or that is substituted with at least one substituent selected from the group consisting of a deuterium atom, a halogen atom, a cyano group, a nitro group, an amino group, a silyl group, an oxy group, a thio group, a sulfinyl group, a sulfonyl group, a carbonyl group, a boron group, a phosphine oxide group, a phosphine sulfide group, an alkyl group, an alkenyl group, an alkoxy group, a hydrocarbon ring group, an aryl group, and a heterocyclic group. L 31 is a nitrogen atom, a substituted or unsubstituted trivalent alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted trivalent aryl group having 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted trivalent heteroaryl group having 1 to 30 carbon atoms for forming a ring, and c is 0 or 1, wherein "unsubstituted" or "substituted" refers to a group that is unsubstituted or that is substituted with at least one substituent selected from the group consisting of a deuterium atom, a halogen atom, a cyano group, a nitro group, an amino group, a silyl group, an oxy group, a thio group, a sulfinyl group, a sulfonyl group, a carbonyl group, a boron group, a phosphine oxide group, a phosphine sulfide group, an alkyl group, an alkenyl group, an alkoxy group, a hydrocarbon ring group, an aryl group, and a heterocyclic group.