Ann Marie Yastishock (born April 20) is an American diplomat who is serving as the United States ambassador to Papua New Guinea, along with the Solomon Islands and Vanuatu.

[5] 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).

[9] Ann Marie Yastishock presented credentials to the Acting Governor General of Papua New Guinea Job Pomat on February 21, 2024.

[10] She presented credentials to the Acting Governor-General of Solomon Islands Patteson Oti on March 14, 2024.