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Black and Hispanic/Latino sexual minority men and gender diverse (SMMGD) individuals report lower uptake and adherence to pre-exposure prophylaxis (PrEP) compared with White SMMGD. For some, the COVID-19 pandemic has resulted in reduced access to PrEP prescriptions and related changes to PrEP use, yet little is known how pandemic-related changes to PrEP access and sexual activity might influence sexually transmitted infection (STI) status and HIV seroconversion among SMMGD of color. We used data from 4 waves of a national study of Black and Hispanic/Latino SMMGD's HIV, PrEP, and health experiences to assess whether self-reported changes to sexual activity were associated with STI status, and whether self-reported changes to PrEP access were associated with HIV seroconversion. Those who reported greater impact to their sexual activity during the pandemic [adjusted odds ratio (aOR) = 1.24; 95% confidence interval (CI): 1.10 to 1.40] and a greater number of sexual partners (aOR = 1.29; 95% CI: 1.21 to 1.38) were more likely to report a positive STI test. In addition, we found that compared with those who did not report pandemic-related changes to PrEP access, those who did report changes to PrEP access had significantly higher odds of HIV seroconversion during the study period (aOR = 2.80; 95% CI: 1.02 to 7.68). These findings have implications for HIV and STI prevention and highlight the importance of novel interventions to improve PrEP access among Black and Hispanic/Latino SMMGD. Importantly, these findings also demonstrate the need to stay focused on key populations at risk of HIV infection during emerging public health crises to avoid an increase in rates of new diagnoses.