Criminal procedure: Rights of the accused: Verdict: Conviction + Acquittal + verdict + Not proven

In law, a conviction is the verdict that usually results when a court of law finds a defendant guilty of a crime. The opposite of a conviction is an acquittal (that is, "not guilty"). In Scotland and in the Netherlands, there can also be a verdict of "not proven", which counts as an acquittal. There are also cases in which the court orders that a defendant not be convicted, despite being found guilty; in England, Wales, Canada, Australia, and New Zealand the mechanism for this is a discharge.

For a host of reasons, the criminal justice system is not perfect: sometimes guilty defendants are acquitted, while innocent people are convicted. Appeal mechanisms and post conviction relief procedures may mitigate the effects of a conviction to some extent. An error which results in the conviction of an innocent person is known as a miscarriage of justice.

After a defendant is convicted, the court determines the appropriate sentence as a punishment. Furthermore, the conviction may lead to results beyond the terms of the sentence itself. Such ramifications are known as the collateral consequences of criminal charges.

A minor conviction is a warning conviction, and it does not affect the defendant but does serve as a warning.

A history of convictions are called antecedents, known colloquially as "previous" in the United Kingdom, and "priors" in the United States and Australia. The history of convictions also shows that a minor law conviction can be prosecuted as any individual's punishment.

In common law jurisdictions, an acquittal certifies that the accused is free from the charge of an offense, as far as the criminal law is concerned. The finality of an acquittal is dependent on the jurisdiction. In some countries, such as the United States, an acquittal operates to bar the retrial of the accused for the same offense, even if new evidence surfaces that further implicates the accused. The effect of an acquittal on criminal proceedings is the same whether it results from a jury verdict or results from the operation of some other rule that discharges the accused. In other countries, the prosecuting authority may appeal an acquittal similar to how a defendant may appeal a conviction.

Not proven (Scots: No pruiven, Scottish Gaelic: gun dearbhadh) is a verdict available to a court of law in Scotland. Under Scots law, a criminal trial may end in one of three verdicts, one of conviction ("guilty") and two of acquittal ("not proven" and "not guilty").