This study aimed to describe the experiences of parents of children with cancer in the diagnosis process. A descriptive qualitative research design and content analysis method were used. Eleven parents participated in the study. Three main themes emerged, each with related sub-themes: encountering a cancer diagnosis, changes in the lives of those affected by the diagnosis, and coping strategies. Upon their children’s diagnosis, parents reported feelings of guilt, regret, helplessness, devastation, constant thoughts of death, and changes in their lives, with some siblings displaying negative reactions. Some children felt their freedom was restricted, and some refused treatment. Parents coped by distracting their attention, praying, receiving support from their family, relatives or health professionals, and maintaining hope for their children’s recovery. The study concludes that parents of children diagnosed with cancer require support to manage and adapt to the diagnosis process and meet their needs effectively throughout this difficult journey.