'neutral third party' is a correct and usable phrase in written English.
This phrase is often used in reference to a person or organization that is unaffiliated in a dispute, transaction, or situation between two other parties. For example: "To ensure a fair ruling, both sides of the argument agreed to hear testimony from a neutral third party."
Maybe mediation by a neutral third party would help?
Neu-Star operates as a neutral third party, under government contract, overseeing the telecommunications industry's master databases, known as the Number Portability Administration Center.
In an Aug. 14 letter the union's president, James J. Claffey Jr., suggested that the Joyce select a neutral third party to review the signed authorization cards.
Fallin "did not assign this duty to a neutral, third party with independent interests", said Dean Sanderford, an attorney for Lockett.
"As a part of our drug testing program, the Commissioner's Office and the Players Association agreed to a neutral third party review for instances that are under dispute.
In part, the N.F.L. players chose to sue because their arbitration hearings were not presided over by a neutral third party, as they are in baseball.
The Marines in my unit overcame any fears on the part of other participants by earning their trust and acting as a neutral third party.
For example, pre-recorded cross examinations by a neutral third party could save victims the trauma of being interrogated by multiple defence barristers without disadvantaging defendants.
The ADR is used where disputes cannot be settled informally but do not proceed to court, they involve a neutral third party.
The customer and the developer agree to store a copy of the source code with a neutral third party such as data-management company.
He added: "Hopefully, as a neutral third party, your findings will be able to shed the truth on the real events happening on the ground".
