Backlog may refer to:
Science, technology and business Product backlog, a list of requirements for a software product in development; see Backlog (academic journals), the phenomenon of a number of accepted papers waiting a significant time to be published Backlog of unexamined patent applications, all patent applications that have been filed and still remain to be examined An argument to Berkeley sockets "listen" function representing the number of pending connections Customer lead time in sales and operations planning
Music Backlog (album), a compilation by Leftfield and Djum Djum Backlog 1987–1991 (1995), an album by Show of Hands Backlog 2 (2011), an album by Show of Hands
See also Tardiness (scheduling), a measure of a delay in executing certain operations