Abstract: A trigger safety block for guns including a unitary rigid block made of rigid plastic or a metal block. The trigger safety block has a rigid plate and two projections extending from the rigid plug through the trigger area of the gun. A first projection extends behind the trigger of the gun to prevent depression of the trigger. A second projection extends through the trigger area in front of the trigger and between the trigger and trigger gun. The first and second projections preferably are dimensioned to frictionally fit between the trigger and tiger guard. Each of the projections has an aligned bore extending therethrough and receives a lock member to prevent the trigger block from being removed from the trigger area.