Background: Cardiovascular diseases are the leading cause of death, both in Poland and worldwide, significantly impacting patients' quality of life. Health behaviors, whether positive or negative, play a crucial role in influencing the incidence of cardiovascular diseases. This study aims to analyze the correlation between health behaviors and the quality of life among patients with cardiovascular diseases. Materials and Methods: The study was conducted among 120 patients (116 eligible) at the Independent Public Provincial Hospital in Poland. Standardized tools including the Health-Related Behavior Inventory (HBI) questionnaire developed by Zygfryd Juczyński, the WHOQOL-BREF Questionnaire, and an original questionnaire with metric data were employed for diagnostic survey. Statistical analysis was performed using the Statistica 10.0 program, with a significance level set at p ≤ 0.05. Results: The respondents' average HBI score was 5.09, while the average overall quality of life score was 3.42, and the average overall health score in the study group was 3.07. Statistically significant correlations were observed between health practices and the assessment of general health, the general index of health behaviors and the level of quality of life in the physical domain, as well as positive mental attitude and quality of life in the psychological domain. Lower quality of life and poorer health status among patients with cardiovascular diseases were associated with increased preventive behaviors and intensified health practices. Conclusions: Despite having a good quality of life on average, individuals with cardiovascular diseases demonstrated moderate health behavior scores. The coexistence of lower quality of life and poorer health status with intensified preventive activities and health behaviors suggests a need for support in mental functioning, as well as adequate education and motivation regarding diet and eating habits. Moreover, it's essential to utilize appropriate techniques to motivate patients to adopt healthier behaviors.