Cosmas Onyia, P.C.Member

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About Cosmas M. Onyia

Cosmas M. Onyia is a lawyer practicing child custody, divorce, family law and 1 other area of law. Cosmas received a B.A. degree from University of North Texas in 1988, and has been licensed for 33 years. Cosmas practices at Cosmas Onyia, P.C. in Phoenix, AZ.

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Reviews for Cosmas

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Overall Rating
Showing 1-4 of 4 client reviews from Lawyers.com
Lawyers.com Rating Snapshot
5 stars
75%
4 stars
25%
3 stars
0%
2 stars
0%
1 star
0%
What do people say on Lawyers.com?
Communication
5.0
Quality of Service
5.0
Responsiveness
5.0
Value for Money
4.5
Divorce
Posted by anonymous
July 04, 2025
Hired Attorney

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 process. If you’re looking for a divorce lawyer who truly cares and knows how to handle your case effectively, I highly recommend him.

 
Family Law
Posted by Archie
January 18, 2022
Hired Attorney

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 time. 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.

 
Divorce
Posted by anonymous
November 03, 2020
Hired Attorney

Mr. Onyia is a magnificent lawyer, and I highly recommend him to anyone looking for a dedicated and passionate lawyer. He is eloquent in his delivery, as well as direct and efficient. As a client, I felt prepared and looped in at all times, without needing to chase him for an update. If you’re looking for a lawyer who will give you 110%, look no further, he’s the one.

 
Family Law
Posted by anonymous
August 22, 2011
Hired Attorney

He is a great gentleman and is very caring and concerned about his clients. He is also very knowledgeable when it comes to Family Law.

Services

Areas of Law

  • Family Law 2
    • Child Custody
    • Divorce
  • Other 1
    • Family

Practice Details

  • Payment Information
    Payment & Cost Features
    Free initial consultation
  • Firm Information
    Position
    Member
    Firm Name
    Cosmas Onyia, P.C.

Experience

  • Bar Admission & Memberships
    Admissions
    1993, Washington
    1994, Arizona
    Memberships
    State Bar of Arizona
    Washington State and American Bar Associations
    The Association of Trial Lawyers of America.
  • Education & Certifications
    Law School
    University of Idaho
    Class of 1991
    J.D.
    Other Education
    University of North Texas
    Class of 1988
    B.A.
  • Personal Details & History
    Age
    Born in 1960
    January 20, 1960

Cosmas M. Onyia

Member at Cosmas Onyia, P.C.
4.9
4 reviews

3636 N. Central Avenue, Suite 800Phoenix, AZ 85012-1938U.S.A.

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