Thirty percent of tuberculosis (TB) patients in New York City in 2007 were not tested for HIV, which may be attributable to differential testing behaviors between private and public TB providers. Adult TB cases in New York City from 2001 to 2007 (n = 5,172) were evaluated for an association between TB provider type (private or public) and HIV testing. Outcomes examined were offers of HIV tests and patient refusal of HIV testing, using multivariate logistic and binomial regression, respectively. HIV test offers were less frequent among patients who visited only private providers than patients who visited only public providers [males: adjusted odds ratio (aOR) 0.33, 95% confidence interval (CI) 0.15-0.74; females: aOR 0.26, 95% CI 0.12-0.57]. Changing from private to public providers was associated with an increase in HIV tests offered among male patients (aOR 1.96, 95% CI 1.04-3.70). Among patients who did not use substances, those who visited only private providers were more likely to refuse HIV testing than those who visited only public providers [males: adjusted prevalence ratio (aPR) 1.26, 95% CI 0.99-1.60; females: aPR 1.78, 95% CI 1.43-2.22]. Patients of private providers were less likely to have an HIV test performed during their TB treatment. Education of TB providers should emphasize HIV testing of all TB patients, especially among patients who are traditionally considered low-risk.