A computer security lock includes a main housing, a key-operated lock having a lock housing disposed in the main housing and having a lock bar extending movably through the lock housing, and a pair ofscissors-type levers. Each lever has opposite proximal and distal end portions, and a medial part between the proximal and distal end portions. The distal end portion has a hook extending outwardly of the main housing to engage a slot in a computer housing. The medial parts of the levers are pivoted to the main housing at a common pivot point. The proximal end portions of the levers are biased toplace the hooks in an unlatching position in which the hooks overlap. A cam is moved by the lock bar to extend toward and between the proximal end protions so that the hooks move away from each other. A cable holder extends around the main housing, and a security cable is connected pivotally to the cable holder.