Pediatric oncology patients face several physical and psychological challenges that can significantly impact their quality of life (QoL) and attitudes toward their illness. Coping strategies are pivotal in managing the emotional and physical burdens of disease. This study aimed to examine the impact of coping strategies of pediatric oncology patients on their QoL and attitudes towards their illness. The descriptive, correlational, and cross-sectional study was conducted with 112 pediatric oncology patients aged 10-18 years. The Sociodemographic Form, Pediatric Cancer Coping Scale (PCCS), Pediatric Quality of Life Inventory (PedsQL), and Child Attitude Towards Illness Scale (CATIS) were used for data collection. Significant correlations were identified between cognitive coping, defensive coping, and CATIS (p<.001). The PCCS and subdimensions significantly predicted CATIS (p<.001), accounting for 15.3% of the cognitive and defensive coping variation. However, there was no relationship between PCCS total and subdimension scores on PedsQL (p=.534). The PedsQL and subdimensions significantly predicted CATIS (p<.001) and accounted for 27.2% of the variation in physical health summary score, emotional functioning, psychosocial health summary score, and total PedsQL score. The study reveals that cognitive coping strategies positively predict attitudes toward illness, whereas defensive coping strategies have an inverse effect. The study proposes that comprehensive care models in pediatric oncology support effective coping mechanisms and enhance the QoL of those who receive them.