Apparatus and methods for bone conduction detection are disclosed herein. An example apparatus includes memory; machine-readable instructions; and processor circuitry to execute the machine-readable instructions to associate a vibration signal with a voice or with motion, the vibration signal transmitted via a bone structure of a user; permit access to a user application based on the association of the vibration signal with the voice; and deny access to the user application based on the association of the vibration signal with the motion.