Abstract: A multi-directional mounting unit is used to mount a bicycle lock on a tubular frame. The mounting unit includes a tubular mounting part that is to be secured tightly on the tubular frame, and a separate tubular retaining part that confines a receiving space to receive one end of a lock body of the bicycle lock therein. The retaining part has a retaining notch that extends from a top edge to an intermediate part thereof for retaining a shackle of the bicycle lock therein. One of the mounting part and the retaining part has an outer wall surface which is formed with at least one axially extending positioning rail that confines a longitudinal slide groove therein. The other one of the mounting part and the retaining part has an outer wall surface which is formed with at least one axially extending insert projection. A selected one of the insert projections is inserted into a selected one of the positioning rails so as to secure the retaining part on the mounting part.