ABSTRACT This study examines the effects of political/cultural beliefs and situational perceptions on public support for government surveillance amidst COVID-19, using a representative survey conducted in Hong Kong. Our results indicate that situational responses (i.e. privacy trust and self-efficacy) balance against each other in mediating the effects of political/cultural beliefs (i.e. political trust, political efficacy, democratic-individualism) and situational perceptions (i.e. perceived cost and benefit of disclosure, perceived threat of COVID-19) on surveillance support. Both perceived benefit of disclosure and political trust positively affects surveillance support indirectly by promoting the contributing mediator privacy trust while suppressing the inhibiting mediator privacy self-efficacy. Perceived cost of disclosure shows no direct effect, but a positive indirect effect on surveillance support by suppressing privacy self-efficacy; perceived threat shows a positive direct effect while a negative indirect effect by suppressing privacy trust. Internal political efficacy shows a strong negative direct effect, but no indirect effect; and external political efficacy shows a negative indirect effect by promoting privacy self-efficacy. Alternative media use, as a proxy for democratic-individualism, mitigates situational perceptions’ effects on surveillance support, regardless of the directions. The findings advance our understanding of the formation process of public opinion on government surveillance.