Short Subject (commonly known as Mickey Mouse in Vietnam) is a 1969 16 mm anti-war underground animated short film. The director was Whitney Lee Savage (father of Adam Savage) and the producer and head designer was Milton Glaser, who produced it independently with a total running time of one minute. The short was not endorsed by The Walt Disney Company.

The short has the satirical theme of Mickey Mouse volunteering for military service, and getting killed within moments of arriving in Vietnam to fight in the Vietnam War.

The short was considered lost media until 2013 when a YouTube user uploaded the full short, albeit with replaced music; the full short with its original music was uploaded in 2018. As it doesn't have a copyright notice, it is in the public domain. However, its sounds, which are taken from other sources, are under copyright.