Only 5-8% of adults with cancer participate in cancer clinical trials (CCTs), with even lower rates among underrepresented groups. Improving oncologists' communication skills may enhance the frequency and quality of their discussions with patients about CCTs, consequently increasing participation. However, little is known about interest in or presence of CCT-related communication training during Hematology-Oncology (Hem-Onc) fellowships. This study aimed to describe, from the perspective of Hem-Onc fellowship program directors (PDs): (1) the current landscape of CCT education for Hem-Onc fellows; (2) the acceptability and feasibility of implementing a CCT communication skills workshop for Hem-Onc fellows. We used an explanatory sequential mixed-methods approach. PDs were surveyed and interviewed about their graduate medical education (GME) programs' current CCT curriculum, training challenges, fellows' CCT knowledge and CCT communication skills, and preferences for a CCT communication workshop. PDs were surveyed (n = 40) and interviewed (n = 12). PDs reported that their institutions prioritize CCT accrual (M = 4.58, SD = .78; 1-5 scale, 5 = "Strongly Agree") and clinical research training (M = 4.20, SD = .85). CCT skills that programs least often addressed were how to (1) discuss CCTs with newly diagnosed patients, (2) talk to patients about CCTs when none are available, and (3) help patients find CCTs at other institutions. PDs were interested in a CCT communication workshop for fellows ("yes" = 67.5%, "maybe" = 32.5%) and said training would be feasible (M = 4.28, SD = .78) and useful (M = 4.47, SD = .78). Qualitative results described programs' current approaches to CCT education and insights about developing and implementing CCT communication training. There is a clear need to improve CCT communication skills training in Hem-Onc fellowship programs and to implement and scale such training to increase CCT participation, especially among diverse patient populations. Furthermore, Hem-Onc GME PDs view such training as feasible and useful.