In a legal dispute, one party has the burden of proof to show that they are correct, while the other party has no such burden and is presumed to be correct. The burden of proof requires a party to produce evidence to establish the truth of facts needed to satisfy all the required legal elements of the dispute. It is also known as the onus of proof.

The burden of proof is usually on the person who brings a claim in a dispute. It is often associated with the Latin maxim semper