An internal voltage generation circuit includes a voltage detection unit configured to generate a voltage detection signal that indicates whether a voltage level of an internal voltage is a first target voltage level or a second target voltage level higher than the first target voltage level, according to control of a normal operation signal. The internal voltage generation circuit also includes an operation control signal generation unit configured to selectively activate an operation control signal in response to the normal operation signal and the voltage detection signal, a periodic pulse signal generation unit configured to generate a periodic pulse signal in response to the operation control signal and the normal operation signal, and a charge pumping unit configured to generate an internal voltage by performing a charge pumping operation according to control of the periodic pulse signal.