Unlike native gay and bisexual male (GBM), immigrant/refugee GBM in Lebanon have an added vulnerability to poor sexual health. The objective was to compare sexual health variables between these two communities. GBM who are immigrants/refugees were more likely to report non-university level of education, heterosexual marriage, engagement in sex work, past diagnosis of syphilis, healthcare and employment stigma, lower STI knowledge, and a higher number of male sex partners. Being foreign and feeling sufficiently informed about STIs were indicators of STI knowledge. This study highlights the roles of education and immigrant/refugee status in STI knowledge in migrant GBM in Lebanon.