Abstract: A lock holder including a split tube-like mounting unit for fixing to the frame of a motorcycle, and a lock carrier unit at one side of the mounting unit for holding a motorcycle lock of the type comprising a U-shaped casing with a cylinder block at one end and a lock cylinder in the cylinder block, and a U-shaped locking bar with a slotted plug rod at one end, wherein the lock carrier unit comprises a flat bottom wall, a round hole at the center of the flat bottom wall for passing the slotted plug rod of the U-shaped locking bar for permitting it to be connected to the U-shaped casing and locked by the lock cylinder, an upright wall raised from the border of the flat bottom wall, a recess on the upright wall at an inner side for receiving the cylinder block, and a through hole through the recess, the keyway of the lock cylinder being aligned with the through hole of the upright wall when the cylinder block is attached to the recess.