This study examined predictors of having received HIV and sexually transmitted disease (STD) testing and having been referred by school staff for HIV/STD testing. In 2014, students in seven high schools completed paper-and-pencil questionnaires assessing demographic characteristics, sexual behavior, referrals for HIV/STD testing, and HIV/STD testing. The analytic sample (n = 11,303) was 50.7% female, 40.7% Hispanic/Latino, 34.7% Black/African American (non-Hispanic), and mean age was 15.86 (SD = 1.22). After controlling for demographic characteristics, significant predictors of reporting having been tested for HIV or STDs were reporting having received a referral for HIV/STD testing (odds ratio [OR] = 3.18; 95% CI = [2.14, 4.70]) and reporting staff following-up on the referral (OR = 3.29; 95% CI = [1.31, 8.23]). Students reporting referrals had significantly higher odds of being male (OR = 2.49; 95% CI = [1.70, 3.65]), "other" or multiracial (non-Hispanic; compared to White, non-Hispanic; OR = 2.72; 95% CI = [1.35, 5.46]), sexual minority (OR = 3.80; 95% CI = [2.57, 5.62]), and sexually experienced (OR = 2.58; 95% CI = [1.76, 3.795]). School staff referrals with follow-up may increase HIV/STD testing among students.