- A mediator helps you reach your own agreement.
- A mediator’s entire job is to help two, or more, parties find their own resolution.
People often use "mediator" and "arbitrator" interchangeably, but the two roles are fundamentally different, not just in name, but in how much power each person actually has over the outcome of your dispute. Understanding the difference between a mediator and an arbitrator in Ontario matters before you agree to either process, because you’re giving up a different amount of control depending on which one you choose.
The Core Difference in One Line
A mediator helps you reach your own agreement. An arbitrator decides the outcome for you.
That single distinction shapes everything else about how each process works.
Side-by-Side Comparison
| Mediator | Arbitrator | |
|---|---|---|
| Decision-making power | None — cannot impose an outcome | Full — issues a binding decision, the award |
| Role in the session | Facilitates discussion, helps identify common ground | Hears evidence and arguments, then decides |
| Outcome if the process doesn’t produce a result | No settlement — the dispute continues elsewhere | Always produces a binding award, once the hearing concludes |
| Confidentiality | Discussions are generally confidential | The hearing is a formal, private proceeding rather than confidential settlement talk |
| Governing framework | Largely contractual, with no dedicated Ontario statute governing private mediation itself | Governed by Ontario’s Arbitration Act, 1991 |
| Enforceability of outcome | A settlement becomes binding only once both sides sign an agreement | The award is generally enforceable much like a court judgment, with limited appeal rights |
| Formality of process | Informal, conversational, flexible | More formal — resembles a private trial, with evidence and submissions |
What a Mediator Actually Does
A mediator’s entire job is to help two, or more, parties find their own resolution. This can involve:
- Meeting jointly with both sides, and sometimes privately with each side separately, a practice known as caucusing
- Identifying the real interests behind each side’s stated positions
- Testing the strengths and weaknesses of each side’s case, in some mediation styles
- Proposing settlement structures for the parties to consider
At no point does a mediator have authority to force either side to accept anything. If neither side agrees, mediation simply ends without a binding outcome.
What an Arbitrator Actually Does
An arbitrator functions much more like a private judge:
- Reviews evidence and hears arguments from both sides, often through a structured hearing
- Applies the relevant law and the terms of the parties’ agreement to the dispute
- Issues a written, binding decision — the arbitration award
- Has that award enforced much like a court judgment if a party doesn’t comply voluntarily
Because an arbitrator’s decision is imposed rather than agreed to, the process resembles a private trial more than a negotiation.
Which One Do You Need?
- Choose, or agree to, mediation if you want to try to preserve control over the outcome and are open to a negotiated compromise.
- Choose, or find yourself bound to, arbitration if you need a guaranteed, final decision and are prepared to accept whatever the arbitrator decides.
- Consider med-arb if you want to attempt mediation first, with a guaranteed binding decision as the fallback if it doesn’t work.
How Each One Is Typically Chosen
A mediator is usually selected by mutual agreement between the parties, or drawn from an approved roster where a court process requires mediation. Because a mediator never imposes a decision, the parties have wide latitude to pick someone whose style and background they’re both comfortable with.
An arbitrator’s selection is more consequential, since that person will ultimately decide the outcome. Parties often specify in advance, within an arbitration clause or a separate arbitration agreement, how the arbitrator will be appointed — for example, by mutual agreement, by each side naming one arbitrator who then jointly select a third, or through a process set out in the Arbitration Act, 1991 if the parties can’t agree. Taking the appointment process seriously matters more for an arbitrator than a mediator, precisely because you can’t simply reject their conclusion once it’s made.
Frequently asked questions
Can the same person be both my mediator and my arbitrator?
Yes, in a med-arb process the same neutral sometimes fills both roles in sequence, mediating first and then arbitrating if needed. Some parties prefer a different person for each role to keep the two functions clearly separate.
Is an arbitrator’s decision final?
Generally yes, subject to only limited grounds of appeal, which is one of the main tradeoffs of choosing arbitration over litigation. The exact appeal rights depend on the parties’ arbitration agreement and the Arbitration Act, 1991.
Do I have to accept whatever a mediator suggests?
No. A mediator can propose ideas and settlement structures, but you are never obligated to accept them. You only become bound once you actually agree to and sign a settlement.
Which is more expensive, mediation or arbitration?
Arbitration is generally more involved and typically more expensive than mediation, since it resembles a formal hearing with evidence and legal argument, while mediation is usually a shorter, more informal process. Exact costs vary widely by dispute.
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