A dog tag is the informal name for the identification tags worn by military personnel, so named as it bears resemblance to pet tags.
Dog tag may also refer to:
In computing
- DogTag, an open source X509 certification authority for SSL and public key infrastructure
In media
- Dog Tags (film), a 2008 film by Damion Dietz
- Digital on-screen graphic, known as DOG tags
Medical
- Medical identification tag, a dog tag, bracelet, or other jewelry worn to provide medical information in an emergency
