Cancer and associated medical treatments affect patients' health-related quality of life (HRQoL) by decreasing functional dimensions of physical, social, cognitive, and emotional well-being, while increasing short and late-term symptoms. Exercise, however, is demonstrated to be a useful therapy to improve cancer patients and survivors’ HRQoL, yet the effectiveness of high-intensity training (HIT) exercise is uncertain. This systematic-review and meta-analysis aimed to analyse the effects of HIT on HRQoL dimensions in cancer patients and survivors as well as evaluate the optimal prescription of HIT. The search followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines (PRISMA) and examined Web of Science and PubMed (Medline) databases. Data was analysed utilizing Review Manager Software. Twenty-two articles were included in the systematic review and seventeen in the meta-analysis. Results showed HIT improved global quality of life, physical functioning, role functioning, social functioning, cognitive functioning, fatigue, pain, dyspnoea, and insomnia, compared to an inactive control group. Whereas no differences were found in contrast to low to moderate-intensity exercise compared to inactive controls. Particular improvements in HRQoL were observed during the cancer treatment and with the following prescription: a training duration of more than eight weeks, a frequency of 2 days/week, a volume of at least 120 minutes/week including 15 minutes or more of HIT. Our findings whilst encouraging, highlight the infancy of the extant evidence base for the role of HIT in the HRQoL of cancer patients and survivors.