Embodiments of the present invention provide a latch and a D flip-flop. The latch includes: a switch, a resistive random-access memory, a bleeder circuit, and a voltage converter. When the switch is in an on state, the voltage converter is configured to output an output signal of the latch according to an input signal of the latch, where the output signal remains consistent with the input signal. When the switch changes from the on state to an off state, the resistive random-access memory is configured to work together with the bleeder circuit to enable an output signal of the latch when the switch is in the off state to remain consistent with an output signal of the latch when the switch is in the on state, thereby implementing a nonvolatile latching function. Because fewer components are used in the latch in the embodiments of the present invention, a circuit structure is simple, a circuit area is reduced, and integrity of an existing logic circuit can be improved.