A foldable thin film transistor (TFT) is provided, the foldable TFT including: a foldable substrate; source and drain electrodes interconnected on the foldable substrate; a channel layer including nanofibers of an organic semiconductor connecting the source and drain electrodes; a gate electrode electronically connected with the source and drain electrodes and the channel layer; and a gate insulating layer disposed between the channel layer and the gate electrode and comprising an ionic liquid and a resin.
