Purpose. This study examines the individual and environmental correlates of home smoking bans among a population-based sample of Mexican-Americans. Design. A telephone survey on tobacco use and home policies was conducted using stratified, random sampling of listed phone numbers. Setting. Surveys were completed by telephone in San Diego, California. Subjects. The sample consisted of San Diego adult residents of Mexican descent (N=1,103). Measures. The interview included questions on home rules regarding smoking in the household and a number of potential correlates, based on the Behavioral Ecological Model (BEM). This model emphasizes the influence of family, social, and cultural factors on health behaviors. Results. Overall, 90.6% of all respondents reported a ban on smoking in the home. Multivariate analyses indicated that home bans on smoking are more likely among individuals that do not smoke, live with children, are more acculturated to U.S. society, report greater aversion to ETS, and/or report more social pressure against indoor smoking. In contrast, smoking bans are less likely among Mexican Americans who live with smokers. Conclusions. Individual and environmental factors play a protective role by increasing the likelihood of smoking bans in the home of Mexican-descent individuals. These factors should be considered for the design of interventions to sustain and promote the adoption of smoking bans in the home among this and other populations.