From their website:

The US-Asia Institute (USAI) is a United Nations-associated non-governmental organization located in the heart of Washington, D.C. Our mission is to encourage dialogue and understanding between the people and governments of the United States and nations of Asia.

Since its inception in 1979, USAI has hosted an internship program for students who are interested in Asian affairs. The Institute selects two to four undergraduates, recent graduates, or graduate students during the summer, winter/spring, and fall terms. The duration of the internship is approximately two to three months, with the possibility of extension. Internships are unpaid.

The USAI Internship Program gives students a unique opportunity for hands-on experience in the field of U.S.-Asian affairs. Throughout the internship, students will play an active role in organizing educational programming, overseas Congressional staff delegations, forums, receptions, and diplomatic off-the-record briefings. Students will also be expected to represent the Institute at Congressional hearings, think-tank briefings, and other networking events in the D.C. area.

The intent of USAI internships is to supplement academic scholarship with a pragmatic program that deals with the realities of the political process in international policy development.

USAI seeks highly motivated undergraduates, recent graduates, and graduate students with a strong interest in US-Asia relations. Foreign applicants are encouraged to apply for internships. Appropriate visa arrangements are the responsibility of individual applicants. We seek individuals possessing strong writing, organizational, and communication skills.

At this time our internship program is in-person.

USAI offers three different types of internships: Political Affairs, Communications, and Rule of Law (summer only).

While the timeframes for the internships are flexible, deadlines are not. Applications will be reviewed on a rolling basis, and no additional applications will be considered if they are not not received by the given deadline.

Winter/Spring Term Deadline: November 1

Summer Term Deadline: March 1

Fall Term Deadline: June 15

See their website for more information.