Background: Bariatric surgery is currently the most successful weight loss intervention for the treatment of obesity, but its long-term success depends on adopting healthy lifestyle pattern. Aim of the study: Was to evaluate home health care intervention for patients with bariatric surgery regarding their lifestyle pattern. Research design: A quasi-experimental research design was used in carrying out this study. Setting: This study was conducted at Surgical Outpatient Clinic affliated to Benha University Hospital and followed by home visits. Sample: Purposive sample of 79 patients was used to conduct this study. Tools: Four tools were used to collect the data in this study. Tool I: A structured interviewing questionnaire that included; socio-demographic characteristics, past history, anthropometric measurements of the patients with bariatric surgery, and knowledge of the patients regarding obesity and bariatric surgery. Tool II: Lifestyle pattern of the patients with bariatric surgery. Tool III: Attitude of the patients regarding bariatric surgery. Tool IV: Observational checklist of home environment of patients with bariatric surgery. Results: 15.2% of the studied patients had good total knowledge level regarding obesity and bariatric surgery pre-home health care intervention which increased to 72.2% & 65.8% post-intervention and at follow-up phase respectively. 30.4% of the studied patients had healthy total lifestyle pattern level regarding bariatric surgery pre-home health care intervention which increased to 81% & 73.4% post-intervention and at follow-up phase respectively. 25.3% of the studied patients had positive total attitude level regarding bariatric surgery pre-home health care intervention which increased to 77.2% & 68.4% post-intervention and at follow-up phase respectively. Conclusion: Home health care intervention had a positive effect on improvement of the knowledge, lifestyle pattern, and attitude of patients with bariatric surgery. There were highly statistically positive correlation between the studied patients’ total knowledge, total lifestyle pattern, and total attitude pre and post-home health care intervention and at follow-up phase (P |