Despite the plethora of college student identity development research, very little attention has been paid to the identity formation of international students. Rather than adopting existing identity theories in college student development, this exploratory qualitative study proposes a new psychosocial identity development model for international students as an alternative theoretical viewpoint. Based primarily on the ethnographic interview data collected from international undergraduate students at a large public institution in the Midwest, the proposed conceptual model, "International Student Identity" ("ISI"), consists of six phases: pre-exposure, exposure, enclosure, emergence, integration, and internationalization. A description of each phase is provided and implications for practice and future research are offered as well. (Contains 1 figure.)