Overlap may mean one of:
In music theory, overlap is a synonym for reinterpretation of a chord at the boundary of two musical phrases.,
In railway signalling, an Overlap (railway signalling) is the length of track beyond a stop signal that is proved to be clear of obstructions, such as other trains, in the controls of the previous signal, as a safety margin.,
Overlap (road), a place where multiple road numbers overlap.,
Overlap add, an efficient convolution method using FFT.,
Overlap coefficient, a similarity measure between sets.,
Orbital overlap, important concept in quantum mechanics describing a type of orbital interaction. Overlap in molecules affects bond strength.