American higher education scholars found that college students' spirituality and religiosity significantly impact their college experiences and outcomes (Astin et al., 2011a, 2011b; Astin & Lindholm, 2011; Kuh & Gonyea, 2006). While attention on the importance of spirituality and religiosity has increased, international students' spirituality and religiosity studies have been largely ignored in existing spiritual and religious research. Thus, to reduce this gap in the literature, this study examined how the spiritual and religious experiences of international students affected college outcomes during college years. In particular, this study utilized the I-E-O framework (Astin, 1993) and student involvement theory (Astin, 1984), which have been widely used to assess the impact of various experiences on college student outcomes (Astin et al., 2011b; Mayhew et al., 2016). The purpose of this study was to examine how international undergraduate students' spirituality and religiosity affect their cognitive, affective, and/or civic outcomes at U.S. universities and colleges. This study also observed how this population's spirituality and religiosity would be affected by various student experiences and educational practices during college. Thus, this study answered the following research questions: (a) To what degree do spirituality and religiosity among international undergraduate students at U.S. universities and colleges change during college? (b) Do spirituality and religiosity affect cognitive, affective, and/or civic outcomes among this population? and (c) If so, what college environments and experiences are associated with the higher level of spirituality and religiosity among this population? A quantitative design using the College Student Values and Beliefs Survey (CSBV) was employed. Among 14,527 students who participated in the 2004 and 2007 CSBV surveys, only 216 data samples reflected undergraduate international students studying at U.S. universities and colleges in this study. Findings revealed that international students experienced spiritual and religious transformation during their college years. Furthermore, this study found the effects of international students' spirituality and religiosity varied across their college outcomes, including cognitive, affective, and civic outcomes. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]