neutral party

Uninvolved third side

A neutral party is someone without a stake in a dispute or conflict, positioned to mediate, arbitrate, or observe fairly.

The term appears in legal contexts, negotiations, and everyday disagreements: We need a neutral party to settle this.

A neutral party's value lies precisely in having no interest in the outcome.

Opposites
involvement/bias

neutral partypartisan

Biased toward one side

advocate · stakeholder · vested interest · faction · ally

role in conflict

neutral partybelligerent

Hostile and eager to clash

combatant · adversary · litigant · disputant · antagonist

stake or interest

neutral partystakeholder

Party with an interest

vested interest · beneficiary · claimant · principal · investor

Family

party, neutral, partisan, neutrality

Familiarity
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Used worldwide · Timeless · Everyday, not technical · Rated G