Background: During the COVID-19 pandemic, the HIV crisis in the Philippines worsened and triggered a chain reaction that disrupted the provision and utilization of HIV services. This study aims to fill in the gap in knowledge by exploring the possible association between sociodemographic characteristics and the barriers to ART adherence for PLHIV in the Philippines at the time of the COVID-19 pandemic. Methods: A cross-sectional study was performed by using a survey questionnaire, which was distributed via online social media (Twitter). Data were analyzed using the Stata software. Results: There is a significant association between the following treatment barriers and sociodemographic characteristics: the location of treatment hubs and respondents who finished college/graduate studies; checkpoints and crossing borders; and (1) respondents from Northern Luzon Region, (2) unemployed respondents and financial assistance-1. respondents 18 to 25 years old; 2. unemployed respondents-(3) respondents who finished elementary/high school and psychosocial support-(1) respondents from the NCR; (2) respondents 26 to 30 years old, stocks of ARVs and other medicines, and employed respondents. Conclusions: The results suggest a necessity for innovative approaches to make HIV care services, particularly ART, more accessible to PLHIV during the COVID-19 pandemic. Future large-scale studies exploring the association between sociodemographic characteristics and barriers to medication adherence of PLHIV during the COVID-19 pandemic are recommended.