Purpose: The objective of this study was to analyze effect size of the intervention studies for posttraumatic growth in patients with cancer. Methods: A total of 871 studies published between 2000 and 2014 were identified by searching Ovid-Medline, CINAHL, PubMed, Scopus, PsycARTICLES, Cochrane library, RISS, and KISS. 15 studies were selected for inclusion in the meta-analysis. Data were analyzed using the Comprehensive Meta-Analysis (CMA) Ver. 3 program and the effect sizes were shown using Hedges's g score. Results: Intervention studies included 5 studies on Cognitive Behavioral Stress Management (CBSM), 4 studies for Mindfulness-Based Stress Reduction (MBSR), 2 studies for couple-based intervention, and 1 study each for health coaching, building resilience, yoga and painting intervention. The overall controlled effect size was 0.335 (95% CI=0.231, 0.438), using a fixed effects model. The most effective intervention was the couple-based intervention (0.368, 95% CI=-0.146, 0.883), followed by MBSR (0.340, 95% CI=0.172, 0.508) and CBSM (0.314, 95% CI=0.139, 0.490). Conclusion: Cancer is one of the most significant traumatic events that affect patients' lives, a few cancer patients have been known to have posttraumatic growth. Therefore it is necessary to consider nursing interventions to increase posttraumatic growth for cancer patients such as couple-based intervention, MBSR and CBSM.