Tuberculosis (TB) is a major cause of morbidity and mortality throughout the world, particularly in developing countries. The response of the patients and treatment outcome depends, in addition to diagnosis, appropriate and timely treatment and host factors, on the virulence of Mycobacterium tuberculosis and genetic polymorphism prevalent in clinical isolates of the bacterium. A number of studies have been carried out to characterize clinical isolates of M. tuberculosis obtained from TB patients. However, the data is scattered in a large number of publications. Though attempts have been made to catalog the observed variations, there is no database that has been developed for cataloging, storing and dissemination of genetic polymorphism information. MTCID (M. tuberculosis clinical isolate genetic polymorphism database) is an attempt to provide a comprehensive repository to store, access and disseminate single nucleotide polymorphism (SNPs) and spoligotyping profiles of M. tuberculosis. It can be used to automatically upload the information available with a user that adds to the existing database at the backend. Besides it may also aid in maintaining clinical profiles of TB and treatment of patients. The database has ‘search’ features and is available at Tb.