BackgroundContinuing futile life-sustaining treatment prolongs patients’ suffering and family members’ and medical staff’s psychological distress. Additionally, continuing futile treatment is inefficient in healthcare resource distribution. Although the withdrawal of futile life-sustaining treatment is ideal, the prevalence is variable.ObjectiveTo synthesise nurses’ and physicians’ experiences with continuing futile life-sustaining treatment in the intensive care unit.DesignThis meta-synthesis was conducted following the thematic synthesis. The Preferred Reporting Items for Systematic Review and Meta-Analyses and Enhancing transparency in reporting the synthesis of qualitative research statement were used in reporting the synthesis of qualitative research statements.Methods and data sourcesA systematic search was conducted following the inclusion and exclusion criteria in APA PsycINFO, CINAHL Plus, EMBASE, MEDLINE, PubMed and Web of Science in May 2023. Two reviewers independently screened and extracted the data. The extracted data were analysed using thematic analysis of qualitative research.FindingsA total of 16 studies were finally included, and 141 quotes were extracted and analysed. The main findings were categorised into four themes: (1) contextual and cultural diversity, (2) perceptions of futile treatment, (3) professional roles and responsibilities, and (4) emotional distress.ConclusionThe study highlights the influence of culture, religion and family members, as well as perceptions of futile treatment among clinicians, on continuing futile life-sustaining treatment. Also, nurses’ awareness of their roles and responsibilities in ensuring patients’ comfort at end of life was revealed. This study informs future research to explore the experiences of futile life-sustaining treatment across various contexts.