Third party may refer to:
- Politics
- Computers
- Third-party developer, hardware or software developer not directly tied to the primary product that a consumer is using
- Third-party software component, reusable software component developed to be either freely distributed or sold by an entity other than the original vendor of the development platform
- Business and marketing
- Third-party verification (TPV), process of getting an independent party to confirm that the customer is actually requesting a change or ordering a new service or product, such as the practice used to prevent Telephone slamming
- Third party technique, marketing strategy commonly employed by public relations firms, that involves placing a premeditated message in the "mouth of the media"
- Third party beneficiary, person who may have the right to sue on a contract, despite not having originally been a party to the contract
- Third party insurance, liability insurance that is designed to offer specific protections against third party claims.
- Other uses