Honor Costello

New York
Phone: +1 212.803.4064
590 Madison Avenue, 20th Floor
New York, NY 10022-2544

Honor Costello is a partner in Crowell & Moring's New York office. Her practice focuses on litigating complex health care, antitrust, intellectual property, and commercial disputes, including class actions and multidistrict litigation (MDL) proceedings. She has represented insurers, reinsurers, managed care organizations, financial institutions, manufacturers, energy companies, and pharmaceutical companies in state and federal litigations.

 Representative matters include:

  • Defending health insurance companies in nationwide and statewide class actions asserting antitrust claims.
  • Representing major automobile manufacturer in nationwide class action alleging vehicle performance defects, breach of warranty, fraud, and consumer protection claims.
  • Representing a medical school in litigation relating to breach of a patent license agreement.
  • Defending health insurers in Employee Retirement Income Security Act (ERISA) litigation.
  • Representing a U.S. reinsurance company in litigations relating to underlying asbestos and environmental losses.
  • Representing a leading marketing and communications agency in a dispute with former employees regarding violation of nonsolicitation covenants and misappropriation of trade secrets.

Honor received her J.D. from Cornell Law School in 2011. While in law school, she served as a managing editor of the Cornell Journal of Law and Public Policy. She also served as a judicial intern to the Honorable Charles J. Siragusa, U.S. District Court for the Western District of New York. Honor graduated from Wellesley College with a B.A. in English.


Admitted to practice: New Jersey, New York, U.S. District Courts for the Southern District of New York, Eastern District of New York, District of New Jersey, and Eastern District of Michigan; U.S. Courts of Appeals for the Seventh and Fourth Circuits; the U.S. Supreme Court

Speeches & Presentations

  • "Critical Junctures: Depositions of Class Representatives and Challenging Expert Testimony at the Class Certification Stage," New York State Bar Association Annual Meeting 2019 – Torts, Insurance and Compensation Law and Trial Lawyers Sections (January 17, 2019). Panelists: Honor Costello and Jacqueline K. Seidel.


Firm News & Announcements

Jun.16.2021 Civil Rights Groups Achieve Voting Rights Victory in Louisiana
Jan.03.2019 Crowell & Moring Elects Eight New Partners and Promotes 21 Associates to Counsel
Jan.09.2017 Crowell & Moring Elects Six New Partners and Promotes 19 Associates to Counsel
Nov.07.2016 Legal Aid Society Honors Crowell & Moring Attorneys for Protecting the Rights of Low Income Workers