How to Legally Change Your Name in Ontario

In Ontario, you legally change your name through ServiceOntario and the Office of the Registrar General under the Change of Name Act, provided you are at least 16 years old and have lived in Ontario for at least 12 months.

Who Can Apply for a Name Change in Ontario

Ontario's name change process runs through the Office of the Registrar General, administered by ServiceOntario, under the authority of the provincial Change of Name Act. It covers legally changing a first, middle, or last name, both for yourself and, in the right circumstances, for a child.

You can apply on your own behalf once you turn 16. If you are 16 or 17, you still need the consent of everyone who holds legal custody of you before ServiceOntario will process the application. Someone younger than 16 cannot apply on their own behalf; a change to a child's name is a separate process, described below, that a parent or guardian starts.

Who Cannot Apply: the July 2026 Ineligibility Bar

Since July 1, 2026, a new section 5.1 of the Change of Name Act makes some people ineligible for any name change in Ontario: anyone required to report under Christopher's Law (the Ontario sex offender registry), and anyone found guilty of, or not criminally responsible for, a criminal offence prescribed by regulation. The list of prescribed offences sits in a regulation rather than the Act itself. The bar has one exception: a change the Attorney General certifies as intended to prevent significant harm to the applicant. Applications submitted before July 1, 2026 are assessed under the old rules, a transition that itself expires about six months after the change came into force. The Registrar General must tell an ineligible applicant that they are ineligible and why. This bar was added by the Safer Streets, Stronger Communities Act, 2024.

Ontario's 12-Month Residency Requirement

You must have been ordinarily resident in Ontario for at least 12 months immediately before you send in your application, or since birth if you are under a year old. This is not something you simply attest to yourself. Ontario requires a guarantor, someone who has known you long enough to personally confirm your Ontario residency, to sign a statement supporting that part of the application.

The list of who can serve as a guarantor is specific: judges, justices of the peace, chiefs of Ontario First Nations, people licensed to solemnize marriages, physicians, members of the Law Society of Ontario, heads of municipal councils, municipal clerks, school principals, and bank or credit union managers, among others named in the application instructions. If you do not know anyone on that list, a non-relative who has known you for at least five years and can confirm your Ontario residency may sign instead.

What the Application Requires

Ontario's process asks for several categories of supporting material rather than a single form. Applicants generally provide:

• Proof of identity
• An Ontario birth certificate, or, for someone not born in Ontario, another form of birth registration or equivalent proof of birth
• A criminal offence declaration for applicants 18 and older, and a police record check where that declaration discloses certain offences. Since July 1, 2026, the Registrar General must also query the Ministry of the Solicitor General before registering or refusing a change, and an application cannot proceed until a required police records check is supplied (s.7.1)
• A guarantor's statement, as described above
• The applicable fee
• A statutory declaration, a formal written statement signed in the presence of a lawyer, notary, municipal clerk, or another commissioner of oaths, confirming the details in the application are true

This article describes what the process involves in general terms. It does not reproduce or fill in ServiceOntario's application forms; applicants should use the current forms and instructions published by the Office of the Registrar General when they actually apply.

Publication in the Ontario Gazette, and When You Can Ask to Skip It

Once approved, most Ontario name changes are published in the Ontario Gazette, the province's official public record. That is the default rule, and it exists so a change of legal identity is a matter of public record, the same reason marriages and some corporate filings are published there.

Ontario recognizes that publication is not safe or appropriate for everyone, though. The Registrar General can grant an exemption from publication, including for a person changing their name to align with their gender identity, for First Nations, Inuit, or Metis applicants who request it, and for any applicant for whom the Attorney General certifies that publication would put their safety at risk, such as someone changing their name because they are fleeing domestic violence. Anyone in that situation should raise it directly with the Office of the Registrar General as part of the application, since the exemption is not automatic.

Special Situations: Marriage, Divorce, and Reverting to a Former Name

A lot of people assume that taking a spouse's surname after marriage requires the same process described above. It does not. Ontario treats assuming a spouse's surname on marriage as a separate, no-cost administrative update, not a legal name change under the Change of Name Act. It does not change the name on your Ontario birth registration or birth certificate.

To update identification after marriage, you bring a current photo health card and a marriage certificate (the official certificate ordered after the ceremony, not the record of solemnization an officiant hands the couple) to a ServiceOntario centre, where a driver's licence and health card can be updated at no charge.

The same no-cost path works in reverse. After a marriage ends through divorce, annulment, or a spouse's death, a person can resume using the surname held before marriage, again using a marriage certificate and other ID as proof, without going through the formal Change of Name Act process. For the divorce process itself, see divorce in Ontario.

Changing a Child's Name in Ontario

Changing a child's legal name is a distinct application from an adult's own name change. It generally needs the consent of everyone who has decision-making responsibility for the child, or, where the people involved cannot agree, a court order settling the issue. A child who is 12 or older must also consent to their own name change.

Ontario also requires that anyone with parenting time or contact with the child, even someone who does not hold decision-making responsibility, be notified that the application has been made, so they have a chance to object before it is approved.

What It Costs and How Long It Takes

Costs and processing times are set administratively and change from time to time, so confirm the current figures on ontario.ca before applying rather than relying on the numbers below.

An incomplete application, a missing document, an unclear guarantor statement, or an outstanding police record check where one is required, adds to the wait. Applicants who want the fastest realistic turnaround should confirm they have every required piece before submitting.

After Your Name Is Legally Changed: What to Update

Once ServiceOntario approves a legal name change, the resulting certificate is the proof used to update identity everywhere else. Common updates include:

• Ontario birth certificate, for someone born in Ontario, through a separate request to the Office of the Registrar General
• Health card, through ServiceOntario
• Driver's licence, through ServiceOntario
• Social Insurance Number record, through Service Canada
• Passport, through Immigration, Refugees and Citizenship Canada
• Bank accounts, employer records, and other private accounts, using the change of name certificate as proof

Step by Step: How the Process Generally Works

1. Confirm you meet the age and 12-month Ontario residency requirements, or that you are applying for a child, with the required consents.
2. Identify a guarantor from the approved categories, or a longtime non-relative acquaintance, who can confirm your Ontario residency.
3. Gather proof of identity and your Ontario birth certificate or other birth registration proof.
4. If you are 18 or older, complete the criminal offence declaration, and arrange a police record check only if that declaration discloses a listed offence.
5. Have a statutory declaration signed in front of a commissioner of oaths, lawyer, notary, or municipal clerk.
6. Submit the complete application and fee to the Office of the Registrar General, and, if it applies, request an exemption from Gazette publication at this stage.
7. Wait for ServiceOntario to process the application, then use the resulting certificate to update other identification.

Ontario is one of several provinces that runs its own name change regime under its own statute; the underlying rules, fees, and required documents differ elsewhere in Canada. See how name changes work across Canada for how other provinces compare. For the broader hub covering support, parenting, and property topics, visit Canadian family law.

Disclaimer: This article explains Ontario's general legal name change process for informational purposes only. It is not legal advice, does not provide or fill in any application forms, and cannot guarantee a specific outcome or timeline. Requirements, fees, and processing times are set administratively and can change; confirm current details with the Office of the Registrar General or a licensed legal professional before applying.