Comprehensive genomic profiling (CGP) and specialized support for adolescent and young adult (AYA) cancer patients are crucial yet underexplored areas of healthcare in Japan. This study investigated awareness of CGP testing and support for AYA cancer patients among healthcare professionals in Osaka. An anonymous online survey was conducted from 31 January to 31 March 2024. The survey targeted all staff, including doctors, nurses, technicians, pharmacists and others, from eight Toyono Medical Area Cancer Medical Network Council hospitals. The survey included questions on basic demographics, awareness of CGP testing and support provided to patients with AYA cancer. Among the 720 respondents, 41.9% were aware of CGP testing, while 20.3% were unaware. Regarding AYA cancer, 60.7% were aware and 14.3% were unaware. Only 7.5% had frequent contact with AYA patients and 96.8% recognized the need for education and information. Awareness of CGP was greater among doctors (72.5%) than among other professionals (34.4%); similarly, AYA cancer awareness was higher among doctors (73.9%) than among other professionals (57.7%). CGP awareness among doctors varied by years of experience and institutional type, being highest in core and cooperative hospitals (80 and 78.6%, respectively) and among doctors with more than 21years of experience (90%). This study reveals significant gaps in CGP and AYA cancer awareness among healthcare professionals in Osaka, Japan, with doctors demonstrating higher awareness levels than other professionals. There is a pressing need for targeted educational programs to enhance the understanding and implementation of CGP and support AYA cancer patients.