A condensed cyclic compound represented by one of Formulae 1A to 1D: wherein, in Formulae 1A to 1D, ring A 1 and ring A 2 are each independently selected from a phenyl group, a dibenzofuranyl group, and a dibenzothiophenyl group, L 1 is selected from groups represented by Formulae 3-15, 3-28, 3-41, and 3-51, L 2 and L 3 are each independently selected from groups represented by Formulae 3-1, 3-15, 3-28, 3-41, and 3-51, a1 to a3 are each independently selected from 0, 1, and 2, R 1 to R 7, R 11 to R 18, R 31, and R 32 are each independently selected from a hydrogen, a deuterium, -F, a cyano group, a C 1 -C 10 alkyl group, and a C 1 -C 10 alkoxy group; a C 1 -C 10 alkyl group and a C 1 -C 10 alkoxy group, each substituted with at least one selected from a deuterium, -F, and a cyano group; and -Si(Q 1)(Q 2)(Q 3), wherein Q 1 to Q 3 are each independently selected from a hydrogen, a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group, b1 and b2 are each independently 0 or 1, c1 is 1 or 2, and c2 is 0, 1, or 2 wherein, in Formulae 3-1, 3-15, 3-28, 3-41, and 3-51, Y 1 is selected from O, S, and C(Z 3)(Z 4), Z 1 to Z 4 are each independently selected from a hydrogen, a deuterium, -F, -Cl, - 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 C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a fluorenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, and - Si(Q 11)(Q 12)(Q 13), wherein Q 11 to Q 13 are each independently selected from a hydrogen, a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a fluorenyl group, a dibenzofuranyl group, and a dibenzothiophenyl group, d4 is an integer selected from 0 to 4, d3 is an integer selected from 0 to 3, and * and *' are each a binding site to a neighboring atom. ring A 1 and ring A 2 are each independently selected from a phenyl group, a dibenzofuranyl group, and a dibenzothiophenyl group, L 1 is selected from groups represented by Formulae 3-15, 3-28, 3-41, and 3-51, L 2 and L 3 are each independently selected from groups represented by Formulae 3-1, 3-15, 3-28, 3-41, and 3-51, a1 to a3 are each independently selected from 0, 1, and 2, R 1 to R 7, R 11 to R 18, R 31, and R 32 are each independently selected from a hydrogen, a deuterium, -F, a cyano group, a C 1 -C 10 alkyl group, and a C 1 -C 10 alkoxy group; a C 1 -C 10 alkyl group and a C 1 -C 10 alkoxy group, each substituted with at least one selected from a deuterium, -F, and a cyano group; and -Si(Q 1)(Q 2)(Q 3), wherein Q 1 to Q 3 are each independently selected from a hydrogen, a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group, b1 and b2 are each independently 0 or 1, c1 is 1 or 2, and c2 is 0, 1, or 2 Y 1 is selected from O, S, and C(Z 3)(Z 4), Z 1 to Z 4 are each independently selected from a hydrogen, a deuterium, -F, -Cl, - 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 C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a fluorenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, and - Si(Q 11)(Q 12)(Q 13), wherein Q 11 to Q 13 are each independently selected from a hydrogen, a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a fluorenyl group, a dibenzofuranyl group, and a dibenzothiophenyl group, d4 is an integer selected from 0 to 4, d3 is an integer selected from 0 to 3, and * and *' are each a binding site to a neighboring atom.