Cosmas Onyia is a Family Law Attorney

Cosmas Onyia is an attorney licensed to practice law in the State of Arizona, Washington and the United States District Court, District of Arizona. Mr. Onyia is a member of the American Bar Association and America Trial Lawyer's Association.

Cosmas Onyia has over 15 years of trial experience and his primary area of practice is in Family and Divorce Matters including: divorce, legal seperation, annulment, spousal maintenance, paternity/maternity, child custody, child support, parenting time, grandparent's rights, & visitation.

Mr. Onyia is dedicated to providing friendly, personal, quality, and cost effective representation to his clients. That's why Mr. Onyia offers a FREE consultation to new clients. Call for details.





COSMAS ONYIA, P.C. is a law firm dedicated to working with clients in finding timely and cost-effective solutions to legal disputes through litigation or alternative dispute resolution strategies. Call today for more information!


602.265.5200

Located in the Security Title Plaza Tower
3636 N. Central Ave. - Suite 800, Phoenix, AZ   85012