This article concerns the structure of covert cells. For other types of cells, see cell.

Cell structure is the form of organization common in covert operations where small groups operate independently and with the identity of cell members unknown to other cells. Secure communication is maintained with the overall organization using "Cut_out" techniques so that any one cell remains secure from other cells. In theory, if security of overall organization or any part of it is compromised, the cell structure means that other cells should be able to continue operating independently.

Cell structure was used by French resistance in World War II and organizations such as the Vietcong and other revolutionary or terrorist organizations where secrecy & security is critical to the continued operation of the organization.