A level shifting circuit with dynamic control includes a dynamic controller and a level shifter. The dynamic controller outputs a dynamic voltage and an output data signal. The level shifter under control by the dynamic controller includes an input signal receiver, an output signal generator, and a bias current controller, which are coupled in series between a ground voltage and a high level voltage. The input signal receiver receives the output data signal of the dynamic controller and the output signal generator produces a level-shifted data signal according to the input data signal. The bias current controller controlled by the dynamic voltage is at a first current-output capability when the level-shifted data signal is at a stable stage and at a second current-output capability when the level-shifted data signal is at an unstable stage. The first current-output capability is greater than the second current-output capability.