Tortious interference is a legal theory intended to allow parties to contract to fulfill contractual obligations without thirdparty interference. If a third party unfairly interferes with a business contract or relationship and causes damage, a tortious interference claim may be a viable option.Tortious interference with business relations involves a third party using false claims against a business in order to drive business away. Interference can occur when an outside party purposefully leads someone in a business agreement to break the terms of the agreement. Interference with an existing contractual relation occurs when a third party interferes with an existing contract between 2 parties. Tortious interference with a contract occurs when a third party intentionally damages the contractual between two parties. Wrongful or tortious interference with contracts happens when a thirdparty intentionally causes a contracting party to commit a breach of contract. Texas Tortious Interference with Contract Law: Tortious Interference vs.