The decision in Dobbs v Jackson Women's Health Organization overturned federal protections for abortion rights, making way for states to enact abortion bans with or without exceptions for the health or life of the pregnant patient. Patient care across many areas of medicine including oncology continues to be affected. Although the change in the legal landscape is widely felt, the core ethical considerations for physicians do not change because of restrictions on the practice of medicine. ASCO offers this guidance to assist US oncologists and institutions who must balance limitations with established ethical duties. This paper articulates principles for cancer care and pregnancy, offers a framework for ethical reflection and action for oncologists who care for pregnant patients, and makes recommendations for individual and institutional action to support evidence-based, patient-centered care in the United States where abortion is illegal or access is limited.