1. An organometallic compound represented by Formula 1:M(L1)n1(L2)n2 Formula 1

M in Formula 1 is selected from Ir, Pt, Os, Ti, Zr, Hf, Eu, Tb, Tm, and Rh,

L1 in Formula 1 is selected from a ligand represented by 2A-1 to 2A-5, 2A-11 to 2A-14, 2A-21 to 2A-25, 2A-31 to 2A-34, 2A-41 to 2A-45, 2A-51 to 2A-54, 2A-61 to 2A-65, 2A-71 to 2A-74, 2A-81 to 2A-85, 2A-91 to 2A-94, 2A-101 to 2A-105, 2A-111 to 2A-114, 2B-1 to 2B-3, 2B-11 to 2B-13, 2B-21 to 2B-23, 2B-31 to 2B-33, 2B-41 to 2B-43, 2B-51 to 2B-53, 2B-61 to 2B-63, 2B-71 to 2B-73, 2B-81 to 2B-83, and 2B-91 to 2B-93,

L2 in Formula 1 is selected from ligands represented by Formula 2C,

each of * and *1 in Formulae 2A-1 to 2A-5, 2A-11 to 2A-14, 2A-21 to 2A-25, 2A-31 to 2A-34, 2A-41 to 2A-45, 2A-51 to 2A-54, 2A-61 to 2A-65, 2A-71 to 2A-74, 2A-81 to 2A-85, 2A-91 to 2A-94, 2A-101 to 2A-105, 2A-111 to 2A-114, 2B-1 to 2B-3, 2B-11 to 2B-13, 2B-21 to 2B-23, 2B-31 to 2B-33, 2B-41 to 2B-43, 2B-51 to 2B-53, 2B-61 to 2B-63, 2B-71 to 2B-73, 2B-81 to 2B-83, 2B-91 to 2B-93, and 2C is a binding site to M in Formula 1,

n1 in Formula 1 is 1, 2, or 3, provided that when n1 is 2 or greater, two or more groups L1 are the same or different,

n2 in Formula 1 is 0, 1, 2, 3, or 4, provided that when n2 is 2 or greater, two or more groups L2 are the same or different,

in Formulae 2A-1 to 2A-5, 2A-11 to 2A-14, 2A-21 to 2A-25, 2A-31 to 2A-34, 2A-41 to 2A-45, 2A-51 to 2A-54, 2A-61 to 2A-65, 2A-71 to 2A-74, 2A-81 to 2A-85, 2A-91 to 2A-94, 2A-101 to 2A-105, 2A-111 to 2A-114, 2B-1 to 2B-3, 2B-11 to 2B-13, 2B-21 to 2B-23, 2B-31 to 2B-33, 2B-41 to 2B-43, 2B-51 to 2B-53, 2B-61 to 2B-63, 2B-71 to 2B-73, 2B-81 to 2B-83, and 2B-91 to 2B-93, X1 is N or C(R1), X2 is N or C(R2), X3 is N or C(R3), X4 is N or C(R4), X5 is N or C(R5), X6 is N or C(R6), and X7 is N or C(R7),

in Formula 2B-1 to 2B-3, 2B-11 to 2B-13, 2B-21 to 2B-23, 2B-31 to 2B-33, 2B-41 to 2B-43, 2B-51 to 2B-53, 2B-61 to 2B-63, 2B-71 to 2B-73, 2B-81 to 2B-83, and 2B-91 to 2B-93, Ti is selected from a single bond, *O*?, *S*?, *N(R31)*?, *C(R31)(R32)*?, *C(R31)?C(R32)*?, and *Si(R31)(R32)*?, wherein R31 and R32 are optionally linked to each other to form a substituted or unsubstituted C5C30 carbocyclic group or a substituted or unsubstituted C2C30 heterocyclic group,

in Formulae 2A-1 to 2A-5, 2A-11 to 2A-14, 2A-21 to 2A-25, 2A-31 to 2A-34, 2A-41 to 2A-45, 2A-51 to 2A-54, 2A-61 to 2A-65, 2A-71 to 2A-74, 2A-81 to 2A-85, 2A-91 to 2A-94, 2A-101 to 2A-105, 2A-111 to 2A-114, 2B-1 to 2B-3, 2B-11 to 2B-13, 2B-21 to 2B-23, 2B-31 to 2B-33, 2B-41 to 2B-43, 2B-51 to 2B-53, 2B-61 to 2B-63, 2B-71 to 2B-73, 2B-81 to 2B-83, and 2B-91 to 2B-93, X11 is N or C(R11), X12 is N or C(R12), X13 is N or C(R13), X14 is N or C(R14), X15 is N or C(R15), X16 is N or C(R16), X21 is O, S, N(R21), or C(R21)(R22),

in Formulae 2A-11, 2A-31, 2A-51, 2A-71, 2A-91 and 2A-111, at least one of X11 to X14 is N, in Formulae 2A-12 to 2A-14, 2A-32 to 2A-34, 2A-52 to 2A-54, 2A-72 to 2A-74, 2A-92 to 2A-94 and 2A-112 to 2A-114, at least one of X11 to X16 is N,

in Formulae 2B-11, 2B-31, 2B-51, 2B-71 and 2B-91, at least one of X11 to X13 is N,

in Formulae 2B-12, 2B-13, 2B-32, 2B-33, 2B-52, 2B-53, 2B-72, 2B-73, 2B-92 and 2B-, at least one of X11 to X15 is N,

R1 to R9, R10 to R16, R21, R22, R31, and R32 are each independently selected from a hydrogen, a deuterium, F, Cl, Br, I, SF5, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C1C60 alkyl group, a substituted or unsubstituted C2C60 alkenyl group, a substituted or unsubstituted C2C60 alkynyl group, a substituted or unsubstituted C1C60 alkoxy group, a substituted or unsubstituted C3C10 cycloalkyl group, a substituted or unsubstituted C1C10 heterocycloalkyl group, a substituted or unsubstituted C3C10 cycloalkenyl group, a substituted or unsubstituted C1C10 heterocycloalkenyl group, a substituted or unsubstituted C6C60 aryl group, a substituted or unsubstituted C6C60 aryloxy group, a substituted or unsubstituted C6C60 arylthio group, a substituted or unsubstituted C1C6o heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, N(Q1)(O2), Si(Q3)(O4)(Q5), B(Q6)(Q7), P(?O)(Q8)(Q9), and Ge(Q51)(Q52)(Q53),

two or more of R1 to R3 are optionally linked to each other to form a substituted or unsubstituted C5C30 carbocyclic group or a substituted or unsubstituted C2C30 heterocyclic group,

two or more of R4 to R7 are optionally linked to each other to form a substituted or unsubstituted C5C30 carbocyclic group or a substituted or unsubstituted C2C30 heterocyclic group,

Y4 and Y5 in Formula 2C are each independently O, N, P, or As, and

at least one substituent of the substituted C5C30 carbocyclic group, substituted C2C30 heterocyclic group, substituted C1C60 alkyl group, substituted C2C60 alkenyl group, substituted C2C60 alkynyl group, substituted C1C60 alkoxy group, substituted C3C10 cycloalkyl group, substituted C1C10 heterocycloalkyl group, substituted C3C10 cycloalkenyl group, substituted C1C10 heterocycloalkenyl group, substituted C6C60 aryl group, substituted C6C60 aryloxy group, substituted C6C60 arylthio group, substituted C1C60 heteroaryl group, substituted monovalent non-aromatic condensed polycyclic group, and substituted monovalent non-aromatic condensed heteropolycyclic group is selected from

a deuterium, F, Cl, Br, I, CD3, CD2H, CDH2, CF3, CF2H, CFH2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C1C60 alkyl group, a C2C60 alkenyl group, a C2C60 alkynyl group, and a C1C60 alkoxy group;

a C1C60 alkyl group, a C2C60 alkenyl group, a C2C60 alkynyl group, and a C60 alkoxy group, each substituted with at least one selected from a deuterium, F, Cl, Br, I, CD3, CD2H, CDH2, CF3, CF2H, CFH2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C3C10 cycloalkyl group, a C1C10 heterocycloalkyl group, a C3C10 cycloalkenyl group, a C1C10 heterocycloalkenyl group, a C6C60 aryl group, a C6C60 aryloxy group, a C6C60 arylthio group, a C1C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, N(Q11)(Q12), Si(Q13)(Q14)(Q15), B(Q16)(Q17), and P(?O)(Q18)(Q19);

a C3C10 cycloalkyl group, a C1C10 heterocycloalkyl group, a C3C10 cycloalkenyl group, a C1C10 heterocycloalkenyl group, a C6C60 aryl group, a C6C60 aryloxy group, a C6C60 arylthio group, a C1C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C3C10 cycloalkyl group, a C1C10 heterocycloalkyl group, a C3C10 cycloalkenyl group, a C1C10 heterocycloalkenyl group, a C6C60 aryl group, a C6C60 aryloxy group, a C6C60 arylthio group, a C1C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from a deuterium, F, Br, I, CD3, CD2H, CDH2, CF3, CF2H, CFH2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C1C60 alkyl group, a C2C60 alkenyl group, a C2C60 alkynyl group, a C1C60 alkoxy group, a C3C10 cycloalkyl group, a C1C10 heterocycloalkyl group, a C3C10 cycloalkenyl group, a C1C10 heterocycloalkenyl group, a C6C60 aryl group, a C6C60 aryloxy group, a C6C60 arylthio group, a C1C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, N(Q21)(Q22), Si(Q23)(Q24)(Q25), B(Q26)(Q27), and P(?O)(Q28)(Q29); and

N(Q31)(Q32), Si(Q33)(Q34)(Q35), B(Q36)(Q37), and P(?O)(Q38)(Q39),

wherein Q1 to Q9, Q11 to Q19, Q21 to Q29, Q31 to Q39, and Q51 to Q53 are each independently selected from a hydrogen, a deuterium, F, Br, I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C1C60 alkyl group, a C2C6o alkenyl group, a C2C60 alkynyl group, a C1C60 alkoxy group, a C3C10 cycloalkyl group, a C1C10 heterocycloalkyl group, a C3C10 cycloalkenyl group, a C1C10 heterocycloalkenyl group, a C6C60 aryl group, a C6C60 aryl group substituted with one of a C1C60 alkyl group and a C6C60 aryl group, a C6C60 aryloxy group, a C6C60 arylthio group, a C1C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.