A logical line of operation (LLO) is an obsolete American military doctrinal concept. It was originally used along with the separate term line of operation which described a geographic line from a base of operations to a military objective. The qualifier "logical" indicated the pursuit of military objectives that did not necessarily require a physical or geographic description, such as governance capacity-building and development activities.
In 2011, the US Army's Field Manual 3-0: Operations rescinded the term in favor of the term line of effort. As there is no joint doctrinal equivalent in the US military, the term has become obsolete in US military vernacular. The terms still exists in various US doctrinal references that have not been updated since 2011.