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Cosmas M. Onyia

5.0
Rating: 6.5

Licensed for 32 years

Divorce and separation Lawyer at Phoenix, AZ
Practice Areas: Divorce & Separation

3636 N Central Ave Ste 800, Phoenix, AZ

About Cosmas

Practice Areas

1

Practice Area

Fees and Rates

Cost

Free Consultation

$0 first 30 minutes


Payment Methods

  • Cash
  • Check
  • Credit Card

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Licenses

Licensed in Arizona for 31 years

State: Arizona

Acquired: 1994

Active

No misconduct found

Licensed in Washington for 32 years

State: Washington

Acquired: 1993

Inactive

No misconduct found

Location

Law Offices of Cosmas M. Onyia

3636 N Central Ave Ste 800, Phoenix, AZ, 85012-1938

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Cosmas M. Onyia's Reviews

Avvo Review Score

5.0 /5.0

4 Client Reviews

5 star (4)
4 star (0)
3 star (0)
2 star (0)
1 star (0)

Posted by Satya S | July 4, 2025 | Hired Attorney

This review is from a person who hired this attorney.

Compassionate and Highly Skilled Divorce Attorney – Highly Recommend!

Cosmas is an excellent divorce attorney. He was always well-prepared in court, especially for cross-examinations, and submitted clear, timely documents that made my case stronger. He took the time to listen and never rushed me, offering practical advice that made me feel supported throughout the proc...ess. If you’re looking for a divorce lawyer who truly cares and knows how to handle your case effectively, I highly recommend him.

Posted by Archie | January 18, 2022 | Hired Attorney

This review is from a person who hired this attorney.

Cosmas Onyia

Thank you so much Mr Onyia for getting me through another crisis and making it look so easy. Your logical and calm demeanor had kept me at ease during this anxious time concerning the custody of my son. Your a heaven sent, like having Einstein, Mohammed Ali and Mike Tyson in my corner at the same tim...e. If your looking for representation in family courts, this is your man. He knows his way around the courtroom. Mr Onyias experience shined throughout my case that went to trial. Mr Onyia was in control the whole time. He knows the law and how to navigate through difficult opposition and circumstances. I've shopped around for family court attorneys in 2019, they all seemed unreasonable and extravagant with their court fee estimates. Mr Onyia was the only one who seemed honest, fair and reasonable. He was worth every penny and more in 2019. He never inflated extra costs or expenses like most lawyers. Now I've just finished up with my uphill custody modification battle in 2022. We won.

Posted by Ryan | January 27, 2018 | Hired Attorney

This review is from a person who hired this attorney.

Outstanding representation

Cosmas Onyia recently represented us in a custody matter. Throughout the process, Cosmas was detailed in his explanation of what to expect. He guided us thru the process and was very timely with responses to any questions we had. He would either answer immediately or within 24 hours. Given that h...e was brought into the case late after poor representation by another council, Cosmas picked up the pieces in short notice and put forth a vigorous case on our behalf. As one might imagine, these type of cases are often quite emotional at times. Ours was no different. When things got upsetting, Cosmas helped to keep us focused and see the bigger picture. Cosmas was very aggressive on our behalf and set forth a determined argument that was presented in an organized expert manner. The opposing council was so out matched by Cosmas that at times we almost felt sorry for the other side. If you have any need for a family lawyer, you would be foolish not to entrust Cosmas to be your council.

Posted by Leticia | May 29, 2015

Divorce case

He was excellent with my case, I cant be more thankful for his excellent service.

See All Client Reviews

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Experience

Rating:  6.5 (Good)

Work Experience

1994 - Present

Attorney, COSMAS ONYIA, PC

Education

1991

University Of Idaho Law School

JD - Juris Doctor

Languages

English

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Avvo Rating Levels
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