As the US wrestles with immigration policy and caring for an aging population, data on immigrants' role as health care and long-term care workers can inform both debates. Previous studies have examined immigrants' role as health care and direct care workers (nursing, home health, and personal care aides) but not that of immigrants hired by private households or nonmedical facilities such as senior housing to assist elderly and disabled people or unauthorized immigrants' role in providing these services. Using nationally representative data, we found that in 2017 immigrants accounted for 18.2 percent of health care workers and 23.5 percent of formal and nonformal long-term care sector workers. More than one-quarter (27.5 percent) of direct care workers and 30.3 percent of nursing home housekeeping and maintenance workers were immigrants. Although legal noncitizen immigrants accounted for 5.2 percent of the US population, they made up 9.0 percent of direct care workers. Naturalized citizens, 6.8 percent of the US population, accounted for 13.9 percent of direct care workers. In light of the current and projected shortage of health care and direct care workers, our finding that immigrants fill a disproportionate share of such jobs suggests that policies curtailing immigration will likely compromise the availability of care for elderly and disabled Americans. A s the US elderly population grows, health care workforce shortages (which already limit care) are expected to increase in the coming decades. The Institute of Medicine projects that 3.5 million additional health care workers will be needed by 2030. 1 Currently, immigrants fill health care workforce shortages, 2,3 providing disproportionate amounts of care overall and particularly for key shortage roles such as rural physicians. 4,5 Immigrant health care workers are, on average, more educated than US-born workers, 2 and they often work at lower professional levels in the US because of lack of certification or licensure. They work nontraditional shifts that are hard to fill (such as nights and weekends), 6 and they bring linguistic and cultural diversity to address the needs of patients of varied ethnic backgrounds. 7,8 The size of the elderly population is expected to double by 2050, 1 raising concern that longterm care workers will be in particularly short supply. Direct care workers-nursing, psychiatric, home health, and personal care aides-are the primary providers of paid hands-on care for more than thirteen million elderly and disabled Americans. 9 These workers help elderly and disabled people live at home 1,9,10 (the preferred setting for most people) by providing assistance with daily tasks such as bathing, dressing, and eating. They also help elderly and disabled people in nursing or psychiatric facilities when liv