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Criminal law
Part of the common law series
Elements of crimes
Actus reus  · Causation  · Concurrence
Mens rea  · Intention (general)
Intention in English law  · Recklessness
Willful blindness  · Criminal negligence
Ignorantia juris non excusat
Vicarious liability  · Corporate liability
Strict liability
Classes of crimes
Felony/Indictable  · Hybrid offence
Misdemeanor/Summary
Infraction
Lesser included offense
Crimes against the person
Assault  · Battery  · Robbery
Kidnapping  · Rape
Mayhem  · Manslaughter  · Murder
Crimes against property
Burglary  · Larceny  · Arson
Embezzlement  · False pretenses
Extortion  · Forgery  · Computer crime
Crimes against justice
Obstruction of justice  · Bribery
Perjury  · Misprision of felony
Inchoate offenses
Solicitation  · Attempt
Conspiracy  · Accessory
Subsets
Criminal procedure
Criminal defenses
Other areas of the common law
Contract law · Tort law  · Property law
Wills and trusts  · Evidence
Portals: Law  · Criminal justice

A lesser included offense, in criminal law, is a crime for which all of the elements necessary to impose liability are also elements found in a more serious crime.

For example, the common law crime of larceny requires the taking and carrying away of tangible property from another person, with the intent to permanently deprive the owner of that property. Robbery, under the common law, requires all of the same elements, plus the use of force or intimidation to accomplish the taking. Therefore, larceny is a lesser included offense in the offense of robbery, as every robbery includes a larceny as part of the crime. Assault is also a lesser included offense of robbery, just as battery is necessarily a lesser included offense to murder, and false imprisonment is usually a lesser included offense to kidnapping.

Under the merger doctrine, lesser included offenses generally merge into the greater offense. Therefore, a person who commits a robbery cannot be convicted of both the robbery and the larceny that was part of it. The major exception to this rule is conspiracy, which does not merge into the crime that the conspirators intended to commit.

In criminal trials, the court is permitted (but not required) to instruct jurors that they can find the defendant guilty of the most serious crime charged, or of a lesser included offense of that crime (in English law, this is termed an alternative verdict). In murder cases, however, where a convicted defendant may face capital punishment, the United States Supreme Court has held that the court must instruct the jury that they may find the defendant guilty of a lesser included offense such as voluntary manslaughter.^[1] The reasoning for this ruling is that jurors given the options of convicting a less culpable killer or letting him go free might opt to convict of a more serious crime than the facts warrant. Therefore, they must have at least one option that falls in between these extremes.

In the case where the jury has the option of convicting a defendant accused of a violation of law where there is a lesser included offense, if the jury acquits the defendant of the more serious offense but deadlocks or is otherwise unable to reach a verdict on the lesser included offense, the defendant may be retried if the prosecutor chooses to do so, but only for the lesser included offense. If the jury finds the defendant not guilty of the lesser included offense, there would be no need to make a determination on the more serious offense as acquittal of a lesser included offense automatically constitutes acquittal of the more serious offense.

1. ^ Beck v. Alabama, 447 U.S. 625 (1980), which overturned an Alabama law prohibiting lesser included offense instructions in capital cases.