Justification may refer to:
- Theory of justification, a part of epistemology that attempts to understand the justification of propositions and beliefs
- Justification (jurisprudence), defence in a prosecution for a criminal offense
- Justification (theology), God's act of declaring or making a sinner righteous before God
- Justification (typesetting), a kind of typographic alignment
- Formal proof, an object that justifies the validity of a formalized statement
- Justification may also refer to ad hoc hypotheses and explanations
- Rationalization (making excuses), a phenomenon in psychology