The Middlebury Institute of International Studies at Monterey (MIIS), formerly known as the Monterey Institute of International Studies, is an American graduate school within Middlebury College, a private university located in Middlebury, Vermont.

Established in 1955, the school provides instruction on a campus in Monterey, California. The Institute offers a wide range of master's programs and certificates in various disciplines such as environmental policy, international business, international policy, language teaching, and translation and interpretation. MIIS has two graduate professional schools known as the Graduate School of Translation, Interpretation, and Language Education (GSTILE) and the Graduate School of International Policy and Management (GSIPM), and several related centers.