Siiddašjávri

or or  is a lake on the border between Norway and Sweden. The lake covers an area of 71.91 km2, with 0.96 km2 of the lake in Norway (Narvik Municipality in Nordland county) and 70.95 km2 in Sweden (Gällivare Municipality in Norrbotten County). The name of the lake comes from the Sami languages, with the ending -jávri or -jávrre being the word for "lake".