A memory device and a method for fabricating the same are provided. The memory device includes a semiconductor substrate, well regions, logic transistors, a high-voltage transistor, and a storage transistor. The well regions are disposed in the semiconductor substrate and include logic well regions, a high-voltage well region, and a memory well region. The logic transistors are disposed on the logic well regions. Each the logic transistors includes a high-k metal gate structure. The storage transistor is disposed on the memory well region, and includes a charge storage structure and a high-k metal gate structure. In the method for fabricating the memory device, a high-k first process or high-k last process is used for the formation of the high-k metal gate structures of the memory device. Because all the logic transistors and the storage transistor are formed with the high-k metal gate structure, a number of masks is decreased.