Background: Children acquire SARS CoV-2 infection from their family members but they experience mild symptoms. Hand washing promotion programs are being executed in many countries to enhance child healthcare development. Objective: This study was designed to identify behavioural determinants to increase hand washing practices among primary school children during COVID-19 pandemic. Methods: This was a cross-sectional study conducted by the Department: of Pediatrics, King Edward Medical University/ Mayo Hospital, Lahore from June to November 2020. Total of 195 mothers of primary school children were enrolled by non -probability consecutive sampling. A 23-item, 5 points likert scale questionnaire assessed 5 domains related to hand hygiene. Data was entered in SPSS 24. Domains were presented as frequency tables. Independent sample t -test was applied to mean score of sub-category of each domain, and to cumulative mean score of each domain. A cut off mean scores of >= 3 was taken as satisfactory. Results: We found satisfactory mean scores amongst mothers for knowledge regarding the importance of hand washing (3.59 +/- 0.62), and commitment regarding maintenance of hand -hygiene (3.44 +/- 0.773). Better mean score for liking hand washing with alcohol rub/sanitizer than with soap and water (3.14 +/- 1.063 versus 1.10 +/- 1.229) was seen. Children reported not feeling dirty if they did not practice hand-hygiene (2.99 +/- 1,195). Elders in the households promoted hand-washing, but lacked practicing it themselves (3.48 +/- 0.881 versus 2.85 +/- 1.242). There was below satisfactory mean score for hand-hygiene amongst children after sneezing, coughing, blowing their nose, or playing (2.50 +/- 1.253, 2.23 +/- 1.265, 2.27 +/- 1.301, 2.83 +/- 1.280 respectively). Norm and self-efficacy factors had adequate overall scores (3.17 +/- 0.84, 3.17 +/- 0.65). The total score for this study was 2.8759 +/- 0.419. Conclusion: We found satisfactory mean scores for risk, attitudes, norms, ability; and self-reglation factorsof hand hygiene among primary school children.