Abstract: A bicycle and bicycle elements theft alarm apparatus which can be attached to a bicycle assembly to activate an alarm member on unauthorized movement, theft of elements of the object, and entire theft of the object. The bicycle theft alarm apparatus includes a housing assembly having an alarm assembly and a control circuit assembly mounted therein. The alarm assembly includes 1) an actuator key pad assembly operable with a secret code for operation thereof; 2) a wheel release actuator member to indicate unauthorized removal of a bicycle support wheel assembly; 3) a seat release actuator member to indicate unauthorized removal of a bicycle support seat assembly; 4) a cable motion detector assembly operable to detect unauthorized detachment from an immovable object used as an anchor member; and 5) a motion detector assembly operable to detect unauthorized vertical or lateral movement of the bicycle assembly.