This quantitative study investigated the impact of campus climate on the ethnic identity development and sense of belonging among Middle Eastern and North African/Southwest Asian and North African (MENA/SWANA) college students. This student population has largely been absent from research due to their classification as White in the U.S. Census and in institutions of higher education. This study included 192 participants from 2- and 4-year public and private colleges and universities across the United States. Using the diverse learning environments (DLE) framework, the study examined the impact of the 11 campus climate factors on ethnic identity development as measured by the Multigroup Ethnic Identity Measure-Revised (MEIM-R) and the Middle Eastern and North African Identity Measure (MENA-IM), along with sense of belonging as measured by the University Belonging Questionnaire (UBQ). Results demonstrated the 11 campus climate factors impacted ethnic identity development overall and exploration more specifically for MENA/SWANA college students. Campus climate also impacted ethnic identity salience and multiculturalism for this student group. Lastly, campus climate had a significant impact on sense of belonging among MENA/SWANA college students. Therefore, institutions of higher education should add a separate race/ethnicity category to identify MENA/SWANA college students and address their needs better. Given the significant role campus diversity plays, colleges and universities should increase recruitment efforts to bring a more diverse student body and encourage and create spaces for meaningful cross-racial interaction and engagement in formal and informal settings. Finally, it is necessary to begin including MENA/SWANA college students in research studies to understand their experiences as a minoritized ethnic group better. [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://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]