The Institute of Diplomacy and International Affairs (abbreviated IDIA; Chinese: 外交部外交及國際事務學院; pinyin: Wàijiāobù Wàijiāojí Guójì Shìwù Xuéyuàn) is an affiliated agency of the Ministry of Foreign Affairs of the Republic of China (Taiwan).

It is responsible for providing professional training to newly recruited and mid-career diplomats and engaging in academic exchanges with other foreign service institutes and policy research institutions.

The IDIA is led by its chancellor and managed by its president and chief secretary.

The incumbent chancellor is Deputy Minister of Foreign Affairs Tien Chung-kwang.

In March 2004, the Executive Yuan gave approval for the establishment of the Institute of Diplomacy and International Affairs, and IDIA was inaugurated on 1 September 2012.