With the increased number of HIV infected patients, tuberculosis has become more frequent in Europe, USA and particularly in Africa. Impaired immunity, poor life conditions and high prevalence of tuberculosis in the general population facilitate the transmission of the disease. Tuberculosis is often seen early in the course of HIV infection and sometimes reveals the underlying immunodeficiency. Most of these cases are due to reactivation of earlier primo-infection when tuberculosis occurs later in the HIV disease, it may be secondary to a recent contagion. The infection may be localized in the lungs or in extrathoracic sites such as lymph nodes, liver, spleen, blood or meninges. The diagnosis is based on direct visualization of acid fast bacilli in gastric aspirate or BAL, on positive blood cultures or in histological findings which often show atypical granulomatous reaction without marked caseation. The role of the intracutaneous tuberculin test remain questionable as it often proves negative. A positive skin reaction can be useful for the diagnosis of tuberculosis, however, this is rarely observed. An early diagnosis is important in order to improve the prognosis and this justifies the frequent instauration of empiric treatment. The usual quadritherapy is efficacious and when started early permits in most cases a favorable outcome. The duration of treatment is poorly standardized but approaches 9-12 months in most instances. The drugs are not always well tolerated. A life-long maintenance therapy seems to have become necessary and primary prophylaxis might be of interest. The increased occurrence of drug resistant stains adds to the interest of preventing transmission, particularly in the hospital.