Grænalón (Icelandic pronunciation: [ˈkraiːnaˌlouːn] ⓘ, "Green Lagoon") was one of the glacial lakes of the Icelandic glacier Vatnajökull.

Grænalón was bound and naturally dammed by the northwestern edge of Skeiðarájökull glacier, which is a Southbound downhill glacial flow from the body of Vatnajökull.

Because of the glacier's considerable thinning and shortening in the last few decades, Grænalón has almost completely drained and disappeared.

At present, the lake does not exist as more than pond, as seen in Google Timelapse.

This Iceland location article is a stub.