The present study aimed to investigate the mediating role of state anxiety in the relationship between the fear of COVID-19 and relationship happiness among married individuals. An additional aim of the study also tested the moderating role of joint family activities between state anxiety and relationship happiness. The study sample consisted of 1713 married individuals (1031 women and 682 men). The study findings showed both the significant direct associations among the studied variables and the mediating role of state anxiety in the relationship between fear of COVID-19 and relationship happiness. It also found that the path of state anxiety to relationship happiness among married individuals having family activities was significantly lower than those who did not. Directions for future research and application were discussed.