M13噬菌体（M13 bacteriophage）为环状单链DNA丝状噬菌体。其核酸由6407个核苷酸组成，衣壳由2700个衣壳粒组成。M13噬菌体感染通常不是致命的，也为非溶菌病毒，但受感染的细菌其生长率会下降。

加利福尼亚大学伯克利分校的生物工程师李承旭和同事发现M13噬菌体具有压电性，可将机械能转化为电能以用于发电。他们将1平方厘米的病毒膜贴到一对金电极上，再在其中一个电极上施加压力，即产生了电力并点亮了一个液晶屏。但其电量较小，仅400毫伏。

M13 is a filamentous bacteriophage composed of circular single stranded DNA (ssDNA) which is 6407 nucleotides long encapsulated in approximately 2700 copies of the major coat protein P8, and capped with 5 copies of two different minor coat proteins (P9, P6, P3) on the ends. The minor coat protein P3 attaches to the receptor at the tip of the F pilus of the host Escherichia coli. Infection with filamentous phages is not lethal; however, the infection causes turbid plaques in E. coli. It engages in a viral lifestyle known as a chronic infection which is neither lytic or temperate. However a decrease in the rate of cell growth is seen in the infected cells. M13 plasmids are used for many recombinant DNA processes, and the virus has also been studied for its uses in nanostructures and nanotechnology.