Principle objective of this article is to Discuss on Legal Defenses and Justifications for Crimes. For an act to be a crime, it must be besides intentional and in violation of criminal law, but also without defense or validation. Defense refers to situations that will mitigate guilt in a criminal case. Two popular defenses are insanity along with entrapment. Justification is any merely cause for committing a great act that otherwise will be a crime. Self‐defense is a prime example. Here also briefly discuss on Insanity, Entrapment and Self-defense all these are call Legal Defenses.