Abstract: A firearm locking device and alarm that incorporates a universal, self-conforming trigger lock which prevents access to the trigger and unauthorized operation of the firearm and deters unauthorized movement. The device comprises a clamp section and an alarm section which houses a motion sensor for detection of movement of the firearm and for generation of an alarm activating signal. An internal microcomputer is provided to receive the alarm activating signal from the motion sensor. The microcomputer will permit sufficient time for the locking device and alarm to be unlocked or disabled. If the unit is not unlocked or disabled following movement of the firearm an audible alarm is activated. A key-actuated switch is provided to enable or disable the firearm locking device and alarm.