Original Oratory (often shortened to "OO") is an event in the National Forensic League and other high school forensics competitions in which competitors deliver an original speech on a subject of their choosing, though the speech must be factual. An Oratory must be written and memorized by the performer and should be no more than ten minutes in length. No more than 150 words can be quoted. This speech should be highly persuasive and is normally about a slightly controversial topic.

Oratory topics are usually over current problems in the world, and are delivered in a persuasive way as to motivate the audience to make a choice. However, this may not always be the case. Some orations may alert the audience of an imminent, definitely not "upcoming" threat, or inspire them to act now. According to the National Forensic League, the competitor is judged through:

Speech Effectiveness: Did the speech have any inspiration or purpose to make the audience react?
Bodily Movement: What gestures did the speaker perform to help the audience better visualize what you're saying?
Support: Was what the speaker said backed up by proof? Was the evidence visualized with current proof, past proof, or quoted by words from other experienced people?
Factual: Is what the speaker saying really true? Was the purpose of your Oration mostly truthful and not mostly opinion based?