Gardsjøen may refer to several lakes in Norway:
Gardsjøen (Grue), a lake in Grue municipality in Innlandet county Store Gardsjøen, a lake in Tynset municipality in Innlandet county Gardsjøen (Sør-Varanger), a lake in Sør-Varanger municipality in Finnmark county
See also Nedre Gärdsjö, a locality situated in Rättvik Municipality in Dalarna County, Sweden