Background: Medical decision-making is the process of shared understanding of a patient’s personal values and subsequent negotiation to reach a treatment decision. Discussing options and engaging patients in decision-making remains a challenge for many clinicians. The challenge is greater when treating older patients, who may be cognitively impaired, and may have family members or caregivers playing significant roles in their care. The geriatric communication skills training (CST) guides clinicians in effectively communicating with older cancer patients and their caregivers around pivotal cancer care decisions. Methods: A multidisciplinary team from a Comprehensive Cancer Center collaborated on the development of a one-day training program, consisting of three geriatric specific CST modules: Geriatrics 101, Cognitive Syndromes and Shared Decision Making. Each module included a brief didactic (30 min) with exemplary videos, followed by experiential role play (90 min) with standardized patients (SP), co-led by multi-disciplinary facilitators. These sessions were video recorded to enable reflective learning, group discussion, and feedback. We examined preliminary efficacy of the intervention on multiple outcomes, including participant course evaluations, self-efficacy and coded SP assessments. Results: 28 clinicians, including mental health professionals, oncologists, family practitioners, physician assistants, nurse practitioners, and social workers participated in the training. All participants reported strong satisfaction results with the workshop. Self-efficacy ratings increased significantly across all three modules, t(21) = -4.58, p < .001 between pre-training (M = 3.39, SD = .66) and post-training (M = 4.13, SD = .59). In SP assessments, participants also demonstrated significant uptake of agenda setting skills and increased responsiveness to caregiver concerns from pre to post training. Conclusions: The geriatric CST program was well received and demonstrated improvements in knowledge. Interdisciplinary training groups present for excellent case discussion and modeling opportunities for a variety of communication challenges.