Colleges and universities are increasingly internationalizing their curricular and cocurricular efforts on campuses; subsequently, it is important to compare whether internationalization at home activities may be associated with students' self-reported development of global, international, and intercultural (GII) competencies. This study examined undergraduate students' participation in study abroad and on-campus global/international activities within nine large public research universities in the United States. Framed within several intercultural development theories, the results of this study suggest that students' participation in activities related to internationalization at home--participation in on-campus global/international activities such as enrollment in global/international coursework, interactions with international students, and participation in global/international cocurricular activities--may yield greater perceived benefits than study abroad for students' development of GII competencies.