Longwave are parts of the radio spectrum with relatively long wavelengths.
Longwave or Long Wave may also refer to:
Science and technology Outgoing longwave radiation, associated with the energy emitted from a planetary body Thermal radiation, when generated by the motion of relatively low-temperature particles Long wave macrotexture, a road characteristic
Arts and entertainment Longwave (band), a rock band from Brooklyn, New York Long Wave, a Jeff Lynne album Longwave (film), a 2013 French-language Swiss-French-Portuguese film, original title Les Grandes Ondes (à l'ouest)
Other uses Kondratiev wave, hypothesized cycle-like phenomena in economics