AimsTo understand the strategies used to continue providing psychosocial support to cancer patients during the pandemic, including outcomes and implications beyond the pandemic.DesignA systematic review of original research.Data SourcesProQuest Health & Medicine, CINAHL Complete (via EBSCOhost), Scopus, and PubMed were searched for original work published between January 2020 and December 2022.MethodsAbstract and title screening identified eligible articles for full‐text review. Following a full‐text review, data were extracted from eligible articles, and a risk of bias assessment was conducted. A synthesis without meta‐analysis was performed.ResultsThirty‐four articles met the selection criteria. These articles provide evidence that systematic adaptations during the pandemic improved the assessment and screening of psychological needs and/or increased the number of clients accessing services. Additionally, while the pandemic was associated with decreased psychosocial well‐being for cancer patients, five intervention studies reported improvements in psychosocial well‐being. Barriers, strategies, and recommendations were described.ConclusionAdapting psychosocial support during a pandemic can be successful, achieved relatively quickly, and can increase the uptake of support for people experiencing cancer.Implications for Patient CareIt is imperative that these adaptations continue beyond the pandemic to maximize adaptive psychosocial outcomes for a group vulnerable to ongoing mental health concerns.ImpactWhile the COVID‐19 pandemic was associated with increased psychosocial need for cancer patients, evidence in the review suggested that adaptations made to service delivery facilitated increased access for patients who may not previously have been able to access support. Additionally, improvements in psychosocial well‐being were achieved. These findings are relevant for clinicians and decision‐makers who fund and design psychosocial support services for cancer patients.Reporting MethodThe review was guided by PRISMA Guidelines and the SWiM Reporting Guideline.Patient or Public ContributionNo patient or public contribution.