This study aimed to determine the effects of the COVID-19 pandemic on service delivery performance and behaviors of healthcare workers in the Province of Sorsogon for the fiscal year 2021. It used the descriptive-survey method and a questionnaire was devised for the gathering of the primary data. The respondents were composed of 157 healthcare workers in the Province of Sorsogon who were purposively chosen. The statistical tools utilized were the frequency count, percentage, weighted mean, and Chi-square test for independence. The study revealed that the majority of the healthcare workers are female, aged 45 years old and below, married, and all are Roman Catholic. Likewise, they are nurses who are on permanent status and assigned to different units. The healthcare workers agreed that they performed the delivery of services along with patient communication, collaborative participation, initiative, responsiveness, and dedication. The religion and gender of the healthcare workers are significantly related to patient communication, collaborative participation, and initiative. Also, religion is significantly associated with responsiveness and dedication. The healthcare workers are neutral about the effects of COVID-19 on work behaviors along with irritability, intolerance, social withdrawal, and institutional trust issues but they agree on paranoia.