Ann Marie Yastishock is an American diplomat who is serving as the United States ambassador to Papua New Guinea, along with the Solomon Islands and Vanuatu.

Yastishock earned her Bachelor of Science in economics from Pennsylvania State University and a Juris Doctor from the Widener University School of Law.^[1]

Yastishock is a career member of the Senior Foreign Service, with the rank of Minister-Counselor. She formerly served as Senior Deputy Assistant Administrator in Bureau for Asia, within the United States Agency for International Development (USAID). She previously was the USAID Mission Director in Hanoi, Vietnam. She has also served as the Chief Advisor to the Acting Administrator and Chief Operating Officer for USAID. Before that, she was the Acting Senior Deputy Assistant Administrator of the Bureau for Asia, responsible for USAID missions and programs in East Asia and the Pacific. She oversaw USAID activities in South and Central Asia as the Deputy Assistant Administrator in the Bureau for Asia. One of her assignments was as a government lawyer in Afghanistan.^[2] Prior assignments in USAID include serving as the Deputy Mission Director for the regional office of USAID covering Ukraine, Moldova, Belarus, and Cyprus; Interim Deputy Mission Director for USAID Burma; deputy director of the USAID Center of Excellence on Democracy, Human Rights and Governance; Senior Legal Advisor to USAID/Afghanistan; and Resident Legal Advisor to Georgia, Armenia, and Azerbaijan. Before her tenure at USAID, Yastishock worked as a Rule of Law Liaison for the American Bar Association/Central and East European Law Initiative with the parliaments of Kazakhstan and Tajikistan.^[1]

In February 2023, a government watchdog reported that several government officials, including Yastishock, were improperly serving in their roles.^[3]

Yastishock is the recipient of numerous USAID performance awards.^[1]

Yastishock is a native of Pennsylvania and speaks Russian.^[1]