An organic light emitting device comprising: an anode; a cathode; a light emitting layer disposed between the anode and the cathode; and a hole transport region between the anode and the light emitting layer, wherein the light emitting layer comprises a compound represented by the following Chemical Formula 1, and wherein the hole transport region comprises a compound represented by the following Chemical Formula 2: in Chemical Formula 1, X is O, or S, L is a bond; or a substituted or unsubstituted C 6-60 arylene, Ar is a substituted or unsubstituted C 6-60 aryl, R and R' are each independently hydrogen; deuterium; halogen; nitrile; nitro; amino; a substituted or unsubstituted C 1-60 alkyl; a substituted or unsubstituted C 3-60 cycloalkyl; a substituted or unsubstituted C 2-60 alkenyl group; a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S, n1 is an integer of 0 to 3, and n2 is an integer of 0 to 4, in Chemical Formula 2, L 1 and L 2 are each independently a bond; or a substituted or unsubstituted C 6-60 arylene, Ar 1 to Ar 4 are each independently a substituted or unsubstituted C 6-60 aryl, Y is CR 1 R 2, NR 1, O, S, or SiR 1 R 2, R 1 and R 2 are each independently a substituted or unsubstituted C 1-60 alkyl, or -L 3 -Ar 5, L 3 is a bond; or a substituted or unsubstituted C 6-60 arylene, and Ar 5 is a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S. an anode; a cathode; a light emitting layer disposed between the anode and the cathode; and a hole transport region between the anode and the light emitting layer, wherein the light emitting layer comprises a compound represented by the following Chemical Formula 1, and wherein the hole transport region comprises a compound represented by the following Chemical Formula 2: in Chemical Formula 1, X is O, or S, L is a bond; or a substituted or unsubstituted C 6-60 arylene, Ar is a substituted or unsubstituted C 6-60 aryl, R and R' are each independently hydrogen; deuterium; halogen; nitrile; nitro; amino; a substituted or unsubstituted C 1-60 alkyl; a substituted or unsubstituted C 3-60 cycloalkyl; a substituted or unsubstituted C 2-60 alkenyl group; a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S, n1 is an integer of 0 to 3, and n2 is an integer of 0 to 4, in Chemical Formula 2, L 1 and L 2 are each independently a bond; or a substituted or unsubstituted C 6-60 arylene, Ar 1 to Ar 4 are each independently a substituted or unsubstituted C 6-60 aryl, Y is CR 1 R 2, NR 1, O, S, or SiR 1 R 2, R 1 and R 2 are each independently a substituted or unsubstituted C 1-60 alkyl, or -L 3 -Ar 5, L 3 is a bond; or a substituted or unsubstituted C 6-60 arylene, and Ar 5 is a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S. X is O, or S, L is a bond; or a substituted or unsubstituted C 6-60 arylene, Ar is a substituted or unsubstituted C 6-60 aryl, R and R' are each independently hydrogen; deuterium; halogen; nitrile; nitro; amino; a substituted or unsubstituted C 1-60 alkyl; a substituted or unsubstituted C 3-60 cycloalkyl; a substituted or unsubstituted C 2-60 alkenyl group; a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S, n1 is an integer of 0 to 3, and n2 is an integer of 0 to 4, L 1 and L 2 are each independently a bond; or a substituted or unsubstituted C 6-60 arylene, Ar 1 to Ar 4 are each independently a substituted or unsubstituted C 6-60 aryl, Y is CR 1 R 2, NR 1, O, S, or SiR 1 R 2, R 1 and R 2 are each independently a substituted or unsubstituted C 1-60 alkyl, or -L 3 -Ar 5, L 3 is a bond; or a substituted or unsubstituted C 6-60 arylene, and Ar 5 is a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S.