后悔是人类的一种心理。后悔通常会在完成某些事或做了某决择之后认为错了之后，企图去改掉却没有办法去改的时候，而产生的心理。

后悔产生的情况很多，视乎该人是否认为自己错了、做错后后果的严重性和该人自己有否懊悔等。

Remorse is an emotional expression of personal regret felt by a person after they have committed an act which they deem to be shameful, hurtful, or violent. Remorse is closely allied to guilt and self-directed resentment. When a person regrets an earlier action or failure to act, it may be because of remorse or in response to various other consequences, including being punished for the act or omission. In a legal context, the perceived remorse of an offender is assessed by Western justice systems during trials, sentencing, parole hearings, and in restorative justice. However, it has been pointed out that epistemological problems arise in assessing an offender's level of remorse.