Daniel Isaac Wikler (born 1946) is an American public health educator, philosopher, and medical ethicist.

He served for two years (1968–1970) as Social Science Analyst in NIMH, the National Institute of Mental Health, in Washington, DC.

Wikler writes, lectures, and advises in bioethics and professional ethics, both internationally and in Greater Boston, including at Harvard.

He is considered a world expert on ethics of the medical definition of death, specifically related to the dead-donor rule with regard to organ transplantation.

Versions of the course have been taught in over a dozen developing nations, including Mexico, South Africa, Nigeria, India, Pakistan, and UAE.

The Program offered fellowships for scholars in developing countries and sponsored an intensive each year for an international clientele.