A fused polycyclic compound of an embodiment is represented by Formula 1, which is defined in the disclosure. An organic electroluminescence device is also provided. The organic electroluminescence device includes a first electrode, a second electrode facing the first electrode, and organic layers disposed between the first electrode and the second electrode. At least one of the organic layers includes the fused polycyclic compound represented by Formula 1, thereby providing improved luminous efficiency to the organic electroluminescence device. A-LB)n  [Formula 1]