The microbial origin of cancer especially caused by the bacteria has been studied in much detail for the last two decades. There are several bacteria documented to cause cancer in human. Helicobacter pylori and Salmonella typhi cause stomach and gallbladder cancers in human respectively. Despite these two important bacteria causing cancer in human there are other bacteria on record to cause a variety of cancers in human. The present paper is an attempt to review the current status of bacteria producing cancer in human on the basis of researches done so far in the same field.