Dianne M. Nast

Attorney Profile

Top Rated Antitrust Litigation Attorney in Philadelphia, PA

NastLaw LLC
 | 1101 Market Street, Suite 2801
Philadelphia, PA 19107
Phone: 215-923-9300
Selected To Super Lawyers: 2004 - 2020
Licensed Since: 1976
Practice Areas:
  • Antitrust Litigation (60%),
  • Personal Injury - Products: Plaintiff (20%),
  • Class Action/Mass Torts: Plaintiff (20%)
Attorney Profile

The founder of NastLaw LLC, Dianne M. Nast has more than 40 years of experience in complex civil litigation. From her office in Philadelphia, Pennsylvania, she provides representation to plaintiffs in antitrust cases involving pharmaceutical manufacturers, defective drug and medical device litigation, and birth defect lawsuits. Ms. Nast has served as lead or co-lead counsel in many class actions.

As an undergraduate, Ms. Nast attended The Pennsylvania State University and received a bachelor's degree magna cum laude. She pursued her legal studies at Rutgers Law School and was awarded her Juris Doctor in 1975. Admitted to practice in Pennsylvania and New Jersey, Ms. Nast is also admitted to practice before the U.S. Courts of Appeals for the 3rd, 5th, 6th, 7th, 8th and 11th Circuits and the Supreme Court of the United States.

Ms. Nast has been appointed as lead counsel in several major lawsuits and has helped to obtain multimillion dollar awards or settlements in many of them. In a multidistrict litigation case involving diet drugs, she was able to obtain a settlement in excess of $6 billion. In another case involving a pharmaceutical remedy for hemophilia, the defendants settled for approximately $600 million. Her successes have not gone unnoticed by her fellow professionals. Ms. Nast has been selected for inclusion in The Best Lawyers in America each year since 2003, and she has received an AV Preeminent* peer review rating through Martindale-Hubbell.

An active participant in several legal organizations, including the American Association for Justice and the American Bar Association, Ms. Nast has also served on the board of directors of the Center for Research on Women and Newborn Health. She is frequently asked to give presentations on topics related to her practice area at continuing legal education seminars.

*AV®, AV Preeminent®, Martindale-Hubbell Distinguished and Martindale-Hubbell Notable are certification marks used under license in accordance with the Martindale-Hubbell certification procedures, standards and policies. Martindale-Hubbell® is the facilitator of a peer review rating process. Ratings reflect the anonymous opinions of members of the bar and the judiciary. Martindale-Hubbell® Peer Review Rating™ fall into two categories – legal ability and general ethical standards.

Practice Areas
  • 60%Antitrust Litigation
  • 20%Personal Injury - Products
  • 20%Class Action/Mass Torts
Focus Areas

Antitrust & Trade Litigation, Medical Devices, Pharmaceutical, Products Liability, Class Actions


Selected to Super Lawyers for 17 yearsbottom-image

Super Lawyers: 2004 - 2020

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About Dianne Nast

Admitted: 1976, Pennsylvania

Professional Webpage: https://nastlaw.com/about-nastlaw/lawyers/dianne-m-nast/


  • AV rating, Martindale-Hubbell
  • Named by Philadelphia Magazine as One of Pennsylvania’s Top Fifty Women Attorneys
  • The National Law Journal, Selected as One of the Nation’s Top Fifty Women Litigators
  • Selected as Super Lawyer
  • annually since 2003, Best Lawyers in America
  • Selected to Chambers USA

Pro bono/Community Service:

  • Past President, Center for Research for Women and Newborn Health (“CROWN”), Chair, St. Leo the Great School Board; member, Lancaster Catholic High Board of Supervisors


  • Factor Concentrate Litigation, (N.D. Ill.), MDL No. 986
  • Diet Drugs Litigation, (E.D.P.A.), MDL. No. 1203
  • Serzone Products Liability Litigation, (S.D.W.V.), MDL No. 1477
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Office Location for Dianne M. Nast

1101 Market Street
Suite 2801
Philadelphia, PA 19107

Phone: 215-923-9300

Dianne M. Nast:

Last Updated: 3/3/2020

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