In embodiments of a flexible display extendable assembly, an extendable assembly includes a slideable display guide integrated in a first housing part of an extendable electronic device. The extendable electronic device includes a flexible display that slide-engages into the first housing part of the extendable electronic device. The extendable assembly includes an extendable mechanism that is coupled in a second housing part of the extendable electronic device and to the slideable display guide. The first and second housing parts of the extendable electronic device slide-engage relative to each other. The extendable mechanism is implemented to extend as the first and second housing parts slide apart relative to each other, and also to retract as the first and second housing parts slide together relative to each other.