A portable firearm with quick coupling removable stock comprising a firearm body, provided with a grip, and a removable stock, which can be associated with the firearm body by means of a quick coupling device; the quick coupling device includes a hollow body, which is fixed to the firearm body, and an elongated body, which is integral with the stock and can be at least partially inserted in the hollow body; the device includes an interference member adapted to lock the elongated body in the hollow body in a locking position; the interference member is movable from the locking position to a release position in which the elongated body is movable and can be extracted from the hollow body. The interference member can be easily actuated by using a component of the firearm itself as a tool.