Allogeneic Haemopoietic Stem Cell Transplant (Allo-HSCT) is a potentially curative option for patients with both malignant and non-malignant hematological disorders. There appears to be unique experiences that adolescents and young adults (AYA) face when undergoing transplant. There is literature to suggest that peer support for young adults is associated with improvements in mental health including greater happiness, self-esteem and effective coping, as well as reductions in depression, loneliness and anxiety. Our primary objective is to determine the feasibility and acceptability of an AYA peer support program for patients undergoing Allo-HSCT. Our secondary objective is to explore the impact of the AYA peer support program on sense of support/connectivity, anxiety, and depression.