Geriatrics is a branch of internal medicine that focuses on health care of the elderly. It aims to promote health and to prevent and treat diseases and disabilities in older adults.

There is no established age or time at which patients may be under the care of a geriatrician. Rather, this is determined by a profile of the typical problems that geriatrics focuses on. This includes the so-called "geriatric giants" of immobility, instability, incontinence and impaired intellect and memory. Health issues in older adults may also include elderly care, delirium, use of multiple medications, impaired vision, and hearing.

The term geriatrics differs from gerontology. This is the study of the aging process itself. The term comes from the Greek geron meaning "old man" and iatros meaning "healer".