UNDONE is a watch brand founded in Hong Kong in 2014.

UNDONE is known for watches that customers can customise online and for collaborations spanning pop culture and traditional crafts. Its collections include the 1960s-inspired Urban chronographs, the Basecamp tool watches and the Aqua automatic divers. The brand moved its headquarters to Tokyo in 2024 and describes its current watches as designed in Japan and powered by Japanese movements.