Good Samaritan Health Professionals Act of 2021 This bill extends liability protection for harm caused by acts or omissions by volunteer health care professionals in the course of providing certain health care services during specified public-health or national emergencies or major disasters. However, such liability protection shall not apply if (1) the harm was caused by willful or criminal misconduct, gross negligence, reckless misconduct, or a conscious flagrant indifference to the rights or safety of the individual harmed; or (2) the health care professional provided services under the influence of alcohol or an intoxicating drug.