An integrated circuit includes a complex logic cell. The complex logic cell includes a first logic circuit providing a first output signal from a first input signal group and a common input signal group, and a second logic circuit providing a second output signal from a second input signal group and the common input signal group. The first and second logic circuits respectively include first and second transistors formed from a gate electrode, the gate electrode extending in a first direction and receiving a first common input signal of the common input signal group.