Anna Lembke (born November 27, 1967) is an American psychiatrist practicing in the field of addiction medicine who is chief of the Stanford Addiction Medicine Dual Diagnosis Clinic at Stanford University. She is a specialist in the opioid epidemic in the United States and the author of ''Drug Dealer, MD, How Doctors Were Duped, Patients Got Hooked, and Why It’s So Hard to Stop''. Her book, ''Dopamine Nation: Finding Balance in the Age of Indulgence'', was released in August 2021 and became a New York Times bestseller.