Introduced here is a modular electronic device case with accessories. The modular electronic device case contains at least two parts: a member surrounding four narrow sides of the electronic device, and a detachable member which can attach and detach from the member and/or the electronic device. The detachable member covers a fifth side of the electronic device, such as the backside of the electronic device. The detachable member can include a mechanical or an electronic accessory, such as a pocket, a surface attachment mechanism such as a suction cup, a camera, a battery, an audio port, etc. The accessories can communicate with the electronic device through wireless, or wired means.