Global warming has increasingly become a prominent problem, and maintenance of the global carbon balance is critical for sustainable development. Carbon cycle, especially organic carbon cycle, is more important than any other global biogeochemical cycles of elements in more than 70% of aquatic biosphere of the earth. Bacteriophages are abundant in the aquatic biosphere, ranging from 10~6/mL to 10~8/mL. The total amount of marine phages is about 10~(30). Bacteriophages play important ecological roles in global organic carbon cycle. It is estimated that the marine bacteriophages are responsible for 26% of the global dissolved organic carbon cycle. Here, the important roles of bacteriophages in organic carbon cycle in marine, freshwater lakes, cryoconite holes and wetlands are reviewed.