The term shock collar is a term used in order to describe a family of training collars (also called e-collars, Ecollars, remote training collars, Zap collars, or electronic collars) that deliver electrical shocks of varying intensity and duration to the neck of a dog (they can also be applied to other places on the dog's body) via a radio controlled electronic device incorporated into a dog collar. Some collar models also include a tone or vibrational setting, as an alternative to or in conjunction with the shock. Others include integration with Internet mapping capabilities and GPS to locate the dog or alert an owner of its whereabouts.

Originally used in the late 1960s to train hunting dogs, early collars were very high powered. Many modern versions are capable of delivering very low levels of shock. Shock collars are now readily available and have been used in a range of applications, including behavioral modification, obedience training, and pet containment, as well as military, police and service training. While similar systems are available for other animals, the most common are the collars designed for domestic dogs.

The use of shock collars is controversial and scientific evidence for their safety and efficacy is mixed. A few countries have enacted bans or controls on their use. Some animal welfare organizations warn against their use or actively support a ban on their use or sale. Some want restrictions placed on their sale. Some professional dog trainers and their organizations oppose their use and some support them. Support for their use or calls for bans from the general public is mixed.