* Judge: This is the closest in meaning, as a judge makes the final decision in a case while a jury decides on guilt or innocence.
* Individual: If you're talking about a single person making a decision instead of a group, "individual" could work.
* Defendant: While not directly opposite in meaning, a defendant is the person being judged by the jury.
* Accuser: Similar to "defendant," this refers to the person who brings the charges against someone.
The best word to use would depend on the specific situation and what you are trying to convey.