Background: Healthy lifestyle is essential for adolescent girls to promote their health. The study aimed to assess healthy lifestyle among secondary school adolescent girls in Iraq. Design: A descriptive correlational research design was utilized to conduct this study. Setting: the study was conducted at 25% of total secondary schools in Iraq it included 6 schools which namely; Masra El-Rasol school, Khadija school, Belquis school, Adhamiya school, Hariri school, Al-Entsar school at Russafa in Baghdad. Subjects: included 200 adolescent student girls from previous mentioned school. Tools: Two tools were used for data collection; first tool: An interviewing questionnaire to assess knowledge regarding healthy lifestyle. Tool two: Fantastic Lifestyle questionnaire which included 15 closed questionnaires. Results: 68.0% of the studied students had average total knowledge about healthy life style, while, 29.5% of them had good total knowledge about healthy life style. In addition to, 2.5% of them had poor total knowledge about healthy life style. Also, 69.5% of the studied students had total psychological healthy lifestyle. While, 62.5% of them had unhealthy social lifestyle and 66.5% of them had total unhealthy lifestyle. Conclusion: There was highly statistically significant correlation between total knowledge about healthy life style of the studied students and total practices about healthy life style. Recommendations: Health educational programs about healthy life style to enhance health promotion.

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