Background: Parent-only psychological interventions can be effective treatments for child anxiety. Involving parents in treatment may be beneficial for children, ensuring that interventions are delivered effectively in a supportive environment. Few studies have investigated the feasibility and acceptability of parent-only interventions for child anxiety. Objective: In this study, we report on feasibility, acceptability and preliminary clinical outcomes of a brief cognitive behavioural group intervention for parents of children (4- to 10-years-olds) experiencing anxiety in the absence of a diagnosed anxiety disorder. Method: Parent participants attended a three-session group intervention delivered online. We collected feasibility information (recruitment and retention rates); parents and children (when appropriate) completed acceptability and clinical outcome measures after each session. Participants were also interviewed about the acceptability of the intervention and study processes. Results: Nineteen parents consented to take part (child mean age 6.47, SD 1.23). Participant retention rates (68.4%) and intervention satisfaction (total mean CSQ score 28.52) were high?. Calculated effect sizes were moderate to large for parent-rated outcomes, small for child self-reported anxiety, and small to moderate for parent confidence/efficacy. Thematic analysis of interview data identified benefits, such as connecting with parents and learning strategies, as well as challenges associated with the intervention. Conclusions: Attendance appeared to be associated with positive changes for parents and children. Overall, participants found this to be an acceptable and useful intervention. These findings demonstrated the potential benefit of a brief intervention for parents of anxious children. A larger trial is required to further investigate these preliminary findings.