One in seven people in the US speak Spanish at home, and twenty-five million people in the US have limited English proficiency. Using nationally representative data from the Medical Expenditure Panel Survey, we compare health care spending for and health care use by Hispanics adults with limited English proficiency with spending for and use by English-proficient Hispanic and non-Hispanic adults. During 2014-18 mean annual per capita expenditures were $1,463 (35 percent) lower for Hispanic adults with limited English proficiency than for Hispanic adults who were English proficient, after adjustment for respondents' characteristics. Hispanic adults with limited English proficiency also made fewer outpatient and emergency department visits, had fewer inpatient days, and received fewer prescription medications than Hispanic adults who were English proficient. Health care spending gaps between Hispanic adults with limited English proficiency and non-Hispanic adults with English proficiency widened between 1999 and 2018. These language-based gaps in spending and use raise concern that language barriers may be obstructing access to care, resulting in underuse of medical services by adults with limited English proficiency.