Langvatnet () is the name of several lakes in Norway.
Langvatnet (Ballangen), a lake in Ballangen municipality, Nordland county Langvatnet (Fauske), a lake in Fauske municipality, Nordland county Langvatnet (Gildeskål), a lake in Gildeskål municipality, Nordland county Langvatnet (Rana), a lake in Rana municipality, Nordland county Langvatnet (Skjåk), a lake in Skjåk municipality, Oppland county Langvatnet (Sørfold), a lake in Sørfold municipality, Nordland county Langvatnet (Sør-Varanger), a lake in Sør-Varanger municipality, Finnmark county Langvatnet (Sunndal), a lake in Sunndal municipality, Møre og Romsdal county Langvatnet (Tysfjord), a lake in Tysfjord municipality, Nordland county
See also Langavatnet