A neuromorphic circuit according to example embodiments of inventive concepts includes a first neuron array including a plurality of neuron circuits generating a spike signal; a first synapse array including a plurality of first synapse circuits to process and output the spike signal transmitted from the first neuron array; a second synapse array including a plurality of second synapse circuits; a first connecting block positioned between the first synapse array and the second synapse array and connecting the first synapse array and the second synapse array in response to a control signal; and a control logic to generate the control signal. The neuromorphic circuit may easily expand the size of the synapse element array to a desired size by using a connecting block.