A Third Party Complaint is a legal complaint that is filed by a person who is not a party in an existing legal dispute. It is a way to involve a third party in a dispute between two or more other parties in order to resolve the issue. There are three types of Third Party Complaints: Intervention, Interpleader, and Subrogation. Intervention: Intervention is when a third party intervenes in an existing legal dispute to protect their own interests. The third party is not a party to the original dispute, but believes that their interests could be harmed if the dispute is not resolved in a certain way. Interpleader: Interpleader is when a third party is brought into a legal dispute in order to settle a dispute between two or more other parties. The third party is usually a neutral party who is not involved in the dispute, and is often used to resolve disputes between parties who are unable to reach a settlement on their own. Subrogation: Subrogation is when a third party is brought into a legal dispute in order to settle a dispute between two or more other parties. The third party is usually a third-party insurer who has paid out a claim on behalf of one of the parties involved in the dispute, and is seeking reimbursement from the other party.