Daniel I. Wikler (born 1946) is an American public health educator, philosopher, and medical ethicist. He is currently Mary B. Saltonstall Professor of Population Ethics and Professor of Ethics and Population Health in the Department of Global Health and Population of the Harvard School of Public Health in Boston. He is Director and a core faculty member in the Harvard Program in Ethics and Health (PEH), which organizes a two-day medical ethics conference each Spring.