Patients and caregivers have unique knowledge and perspectives about living with an illness that can help inform health technology assessments (HTA). Their involvement is recommended at every stage of the HTA process, from topic selection to disseminating results. However, challenges exist in ensuring patient views are representative and not biased. Different countries in Europe are implementing patient involvement in HTA to varying degrees, with some holding training programs and allowing patient groups to initiate research or contribute to appraisals. Ongoing efforts are needed to strengthen patient involvement through resources, training, and embedding it in all new HTA processes.