0.05). The intervention, based on the Testicular Cancer Health Belief Model, significantly improved participants\\\' health beliefs and behaviors. Positive changes were observed in perceived sensitivity, seriousness, benefits, and self-efficacy, alongside reduced perceived barriers (p < 0.05). Conclusion: Online education positively influenced health beliefs related to testicular cancer, highlighting its potential in awareness and proactive health engagement. This study enriches the limited research on health beliefs and early diagnostics among young Turkish males, emphasizing the utility of digital platforms in addressing critical health concerns."> 0.05). The intervention, based on the Testicular Cancer Health Belief Model, significantly improved participants\\\' health beliefs and behaviors. Positive changes were observed in perceived sensitivity, seriousness, benefits, and self-efficacy, alongside reduced perceived barriers (p < 0.05). Conclusion: Online education positively influenced health beliefs related to testicular cancer, highlighting its potential in awareness and proactive health engagement. This study enriches the limited research on health beliefs and early diagnostics among young Turkish males, emphasizing the utility of digital platforms in addressing critical health concerns." > Effect of Online Education Given to Young Adults on Testicular Cancer Health Beliefs and Behaviors