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William N. Harwin, MD

An innovator and leader in the field of medical oncology/hematology, William N. Harwin, MD is a highly respected clinician and researcher, as well as medical administrator.

Since founding Florida Cancer Specialists & Research Institute (FCS) in 1984, Dr. Harwin has guided the organization to a national reputation for excellence. He started his medical practice as a solo practitioner with his wife, Marilyn, as the only employee on February 23, 1984.

Dr. Harwin is passionate about ensuring that patients have convenient access to world-class oncology care close to home.  Board-certified in Internal Medicine, Medical Oncology and Hematology, he provides compassionate, personalized care to patients in Lee County, with a focus on encouraging participation in clinical trials.

Although he treats all forms of cancer, Dr. Harwin has a special interest in lymphomas, gastrointestinal cancer, prostate cancer and breast cancer, having lost his first wife to the disease in 2006. His personal experience with cancer has given him a unique perspective, both as an oncologist and as a single father.

Each year he has been named one of the top doctors in Southwest Florida by “Castle Connolly: America’s Top Doctors.” Winners of this prestigious award are peer-nominated and then reviewed and chosen by a national, physician-led panel, ensuring the highest practice standards are achieved.

After receiving his medical degree from Baylor College of Medicine in Houston, Texas, Dr. Harwin completed his internship and residency in Internal Medicine, and a Fellowship in Hematology and Medical Oncology at the University of Miami.

A past president of the Florida Society of Clinical Oncology (FLASCO), Dr. Harwin remains active in physician education. He is a noted lecturer and has published in leading medical journals, including the Journal of Clinical Oncology. He served for a number of years  on the Editorial Board for the Oncology Business Review(OBR). In 2015, Dr. Harwin was named to the Physician Advisory Panel for Florida Blue (Blue Cross/Blue Shield), one of the largest health insurance companies in the state.

Dr. Harwin has served as a principal investigator in numerous clinical trials throughout his career and was a driving force in developing the FCS Phase 1 Clinical Trials Program, which has set a national benchmark for community oncology and rivals programs at many large academic medical centers.  From 2010 through 2021, Dr. Harwin was the highest accrurer of Phase 1, 2 and clinical trials amongst the entire FCS physician practice.

In addition to his dynamic medical practice, Dr. Harwin is devoted to his family of four adult children and seven grandchildren and his significant other, Ronda.

Treatments Provided
  • Hematologist
  • Medical Oncologist
Languages Spoken
  • English

Medical School

  • Baylor College of Medicine


  • University of Miami


  • Oncology/Hematology
  • University of Miami

Board Certified

  • Internal Medicine, Medical Oncology and Hematology

Honors & Achievements

  • 2013 Castle Connolly: America’s Top Doctors
  • 2014 Castle Connolly: America’s Top Doctors

Professional Affiliations

  • Florida Association of Clinical Oncology (FLASCO), Board Member, Fort Myers
  • Florida Association of Clinical Oncology (FLASCO), Past President, 1994-95
Meet Dr. William Harwin, Medical Oncologist

A medical oncologist for more than 35 years, Dr. William Harwin says he still loves coming to the office every day and taking care of patients with blood diseases and cancer. His personal experience of losing his wife to breast cancer has given him a deep personal understanding of how a cancer journey impacts family members as well as patients.

Dr. Harwin has been a driving force in the growth and expansion of Florida Cancer Specialists and its Phase 1 Clinical Trials Program. He actively encourages his patients to participate in clinical trials and takes great pride in recommending advanced therapies that were once studied in research conducted at FCS.

Dr. Bill Harwin - Florida Cancer Specialists & Research Institute

Dr. Bill Harwin talks about his passion for practicing medical oncology and caring for his patients.