© 2018 Elsevier Inc. Background: Disparities in tobacco use prevalence, behaviors, and services have been identified among people of different racial and ethnic groups in the United States general population. Persons in addiction treatment have among the highest smoking prevalence of any population. However, little is known about racial and ethnic disparities in tobacco use prevalence, behaviors, and services among persons in addiction treatment. Methods: Survey data were used from 1840 clients from 24 addiction treatment programs from the NIDA Clinical Trials Network. Multivariate regression analyses were conducted to assess associations between race/ethnicity (White, African American, Hispanic) and patterns of tobacco and other tobacco product use, as well as quitting behaviors and receipt of tobacco cessation services among current smokers (n = 1425) while in treatment. Results: There was no difference in cigarette smoking prevalence across racial/ethnic groups. In the multivariate models, Hispanics and African Americans, compared to Whites, were less likely to be daily smokers, use smokeless tobacco, or use e-cigarettes. African Americans and Hispanics reported more past-year quit attempts and higher use of menthol compared to Whites. Hispanics were more interested in quitting while in treatment than Whites. Contrary to expectations, African Americans reported receiving more tobacco cessation advice and services while in treatment than Whites. Conclusions: Some findings reflected broader population patterns (e.g., tobacco use behaviors, other tobacco product use), while others did not (e.g., no difference in tobacco use prevalence by race/ethnicity). The reasons for greater receipt of cessation services among African Americans are unclear. Findings indicate the need for continued engagement of African Americans and Hispanics in cessation services while in addiction treatment, and for addressing heavier tobacco use and lack of interest in cessation during treatment among White clients.