Other Healthcare Providers
Find a Dietitian: A Search Tool for Consumers and Health Professionals (American Dietetic Association)
Find a Nurse-Midwife (American College of Nurse-Midwives)
Find a Professional Therapist (Anxiety Disorders Association of America)
Genetic Counseling Resources (National Society of Genetic Counselors)
Directory of Practitioners (National Certification Commission for Acupuncture and Oriental Medicine)
Occupational Therapy Specialist Directory (American Occupational Therapy Association)

Specialists
Physician Directory (American College of Obstetricians and Gynecologists)
American Academy of Pediatrics Pediatrician Referral Service 
American Osteopathic Association D.O. Database 
Find a Podiatrist (American Orthopaedic Society for Sports Medicine)
Cancer Genetics Services Directory (National Cancer Institute)
Fellowship Database (American College of Surgeons)
Find a Dermatologic Surgeon (American Society for Dermatologic Surgery)
Find a Dermatologist (American Academy of Dermatology)
Find a Foot and Ankle Surgeon (American College of Foot and Ankle Surgeons)
Find a Gynecologic Oncologist (Women's Cancer Network)
Find a Hand Surgeon (American Society for Surgery of the Hand)
Find a Health Care Professional (Dystonia Medical Research Foundation)
Find a Heart Rhythm Specialist (North American Society of Pacing and Electrophysiology)
Find a Neurologist (American Academy of Neurology)
Find a Neurosurgeon (American Association of Neurological Surgeons, Congress of Neurological Surgeons)
Find a Periodontist (American Academy of Periodontology)
Find a Physical Medicine & Rehabilitation Physician (American Academy of Physical Medicine and Rehabilitation)
Find a Plastic Surgeon (American Society of Plastic Surgeons)
Find a Reproductive Endocrinologist (Society for Reproductive Endocrinology and Infertility)
Find a Reproductive Surgeon (American Society for Reproductive Medicine)
Find a Rheumatologist (American College of Rheumatology)
Find a Specialist (Hormone Foundation)
Find a Thyroid Specialist (American Thyroid Association)
Find an Allergist: Search (American Academy of Allergy, Asthma, and Immunology)
Find an Endocrinologist  (American Association of Clinical Endocrinologists)
Find an Eye M.D. (American Academy of Ophthalmology)
Find an Interventional Radiologist (Society of Interventional Radiology)
Find an Oncologist (American Society of Clinical Oncology)
Find an Orthopaedist (American Academy of Orthopaedic Surgeons)
Find an Otolaryngologist (American Academy of Otolaryngology-Head and Neck Surgery, Inc.)
Find-a-Doctor (Crohn's & Colitis Foundation of America)
Finding an Eye Care Professional (National Eye Institute)
Gastroenterologist Locator Service (American Gastroenterological Association)
Member Directory (American Venous Forum)
Search for Eating Disorder Treatment Providers (National Eating Disorders Association)
Seeking Help: Physicians Who Specialize in Tremor (International Essential Tremor Foundation)
Spine Directory - Online Physician Directory (Spine-health.com)