Third-Party vs. Third Party – Which is Correct?
Both third-party and third party are correct, but they serve different grammatical roles. Third party is usually a noun meaning an outside person or organization. Third-party is an adjective describing something supplied, managed, or verified by that outside entity. Use the hyphen when it modifies a noun directly.
Third-Party or Third Party – Which is Correct?
Third party is generally an open compound noun. It refers to a person, company, group, or organization that is separate from the two primary parties in an agreement, transaction, dispute, or system.
Third-party is a hyphenated compound adjective. It describes a product, service, provider, review, application, payment, or other noun connected with an outside person or organization.
For example, write “We hired a third party to review the contract,” but “We hired a third-party reviewer.” The noun phrase remains open, while the adjective is hyphenated before the noun it modifies.
Although both topics involve grammatical labels, First Person vs. Third Person addresses viewpoint rather than compound-word formation.
The Best Trick to Remember the Difference
Use the noun test: if the phrase names the outside person or organization, write third party. If it describes something associated with that outside entity, write third-party.
Another useful trick is to look at the word that follows. Before a noun, the compound usually needs a hyphen: third-party software, third-party seller, or third-party analysis. When the phrase itself is the subject or object, leave it open: a third party intervened.
| Word | Part of Speech | Meaning | Example |
|---|---|---|---|
| third-party | Compound adjective | Relating to an outside person or organization | The company uses third-party software. |
| third party | Compound noun | An outside person or organization | A third party reviewed the evidence. |
How to Use Third-Party
Third-party is a compound adjective used to modify a noun. It commonly appears in business, law, technology, finance, cybersecurity, insurance, and government writing. The hyphen makes it clear that third and party work together as one adjective.
Use it before nouns such as provider, vendor, service, application, payment, review, and assessment. This form is appropriate in both formal and casual writing.
Example 1: The retailer relies on a third-party payment processor.
Example 2: A third-party auditor examined the company’s financial records.
Example 3: The application allows third-party developers to create extensions.
Etymology of the Word Third-Party
Third-party combines the ordinal adjective third with the noun party. In legal and commercial language, a party is a person or group involved in an agreement or proceeding. The hyphenated adjective developed to describe something connected with an outside party.
How to Use Third Party
Third party is a compound noun referring to an outside individual, group, company, or institution. It is used when two primary parties are already understood or identified. For example, in a contract between a buyer and seller, an independent inspector may be called a third party.
The phrase is common in formal writing, legal documents, business communication, politics, insurance, and everyday explanations. It can function as a subject, object, or object of a preposition.
Example 1: The two companies asked a third party to settle the disagreement.
Example 2: The contract prohibits disclosure of the information to a third party.
Example 3: An independent third party confirmed that the report was accurate.
What Are the Different Forms of Third Party?
The singular form is third party. Its standard plural form is third parties. Because party changes to parties when it refers to multiple people or organizations, the phrase is not pluralized as third partys or third partys.
Examples include “Several third parties submitted proposals” and “The agreement protects the rights of third parties.” When the plural phrase modifies another noun, the adjective remains hyphenated: third-party agreements means agreements involving or supplied by outside entities.
Etymology of the Word Third Party
Third party is formed from third, meaning an additional person or group after two others, and party, a word historically associated with a person or group involved in an action, dispute, or agreement. Its legal sense has helped establish its modern business and everyday meanings.
Related Concepts
Understanding compound nouns and compound adjectives makes the difference between third party and third-party easier to recognize.
- Compound noun: A compound noun combines two or more words to name a person, place, object, or idea. In third party, the phrase names an outside participant.
- Compound adjective: A compound adjective combines words to describe a noun. In third-party service, the hyphen shows that third-party functions as one modifier.
- Hyphenated modifier: A hyphen can connect words that jointly modify a following noun, preventing confusion about how the words relate to one another.
- Open compound: An open compound contains multiple words that work together without a hyphen. Third party is normally written this way when it functions as a noun.
Examples from Media and Literature
The distinction appears frequently in journalism, legal reporting, technology coverage, and fiction involving contracts or investigations.
- News reporting: A technology article might explain that a company shared customer data with a third party.
- Cybersecurity coverage: A report may warn readers about vulnerabilities in third-party software.
- Business journalism: An article about a merger could state that a third-party consultant evaluated the proposed deal.
- Legal drama: A character might ask a third party to mediate a dispute between two opposing groups.
- Financial reporting: A news story may refer to a third-party payment provider handling online transactions.
Practice Exercises
Choose the correct word or phrase to complete each sentence.
- The company hired a ______ auditor to examine its records.
- The contract requires approval from a ______ before the transfer can proceed.
- Customers should not share their passwords with any ______.
- The website uses ______ cookies for analytics and advertising.
- A neutral ______ helped the two organizations reach an agreement.
Answer Key
- third-party
- third party
- third party
- third-party
- third party
Third-Party Synonyms
| Synonym | Definition |
|---|---|
| External | Coming from outside an organization or system |
| Outside | Not belonging to or controlled by the primary organization |
| Independent | Operating separately and without direct control from the main parties |
| Outsourced | Provided by an external company or person |
Third Party Synonyms
| Synonym | Definition |
|---|---|
| Outside party | A person or organization not directly included among the primary parties |
| External party | An organization or individual outside the main group or agreement |
| Intermediary | A person or organization that acts between two other parties |
| Nonparty | A person or organization that is not a direct party to a legal or formal matter |
Frequently Asked Questions
Question 1: Is “third-party” hyphenated?
Yes, third-party is hyphenated when it functions as a compound adjective before a noun, as in third-party vendor or third-party data.
Question 2: Is “third party” one word?
No. When it functions as a noun, it is normally written as two words: third party. Its plural form is third parties.
Question 3: Should I write “third party provider” or “third-party provider”?
Write third-party provider. The phrase third-party acts as a compound adjective modifying provider, so the hyphen improves clarity.
Question 4: What is the difference between a third party and a third-party company?
A third party is the outside person or organization itself. A third-party company is a company described as being outside the primary organization or transaction.
Conclusion
Third party is the correct open compound when you are naming an outside person or organization. Third-party is the correct hyphenated form when the phrase acts as an adjective before a noun. Pro Tip: Using the right form in contracts, reports, emails, and professional documents demonstrates precision and protects your credibility.
