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Background: This paper presents the rationale and study protocol for a pragmatic controlled effectiveness trial of Truce, a prevention-based selective intervention targeting the significant mental health needs of young people who have a parent with cancer., Methods/design: Truce is a seven week, facilitated, face-to-face group program. The design is a 2 groups (intervention vs control) x 3 (pre-treatment vs post-treatment vs 2 month follow-up) repeated measures. Allocation to groups will be dependent upon recruitment; when groups have sufficient numbers, they will be assigned to the intervention condition, but participants recruited without a viable group will be assigned to the wait-list control condition. Eligible participants are young people aged 14 to 22 years who have a parent diagnosed with cancer within the last 5 years. Wait-list controls are offered the opportunity to participate in the program once they have completed their follow-up questionnaires. The target sample size is 65 participants in each condition. The primary hypothesis is that participants in the intervention will show significant reductions in distress and increases in psychological well-being relative to participants in the wait-list control group, and these effects will continue through two-month follow-up. Mixed-models analysis of variance will be used to measure differences between the two conditions. Secondary analyses will focus on variables which may relate to the effectiveness of the intervention: ACT-related concepts of experiential avoidance and mindfulness, family functioning, unmet needs and demographic variables. We will also assess program fidelity and satisfaction., Discussion: The development and evaluation of a manualised intervention for young people with a parent with cancer responds to a gap in the provision of empirically-based psychological support for this vulnerable group., Trial Registration: Australian and New Zealand Clinical Trials Registry ACTRN12615000761561. Registered 22(nd) July 2015.