Dyngjujökull (], shield volcano glacier) is an outlet glacier of the Vatnajökull glacier in Vatnajökull National Park, Iceland. The glacier is in the Icelandic Highlands and is situated between Bárðarbunga, Holuhraun and Kverkfjöll. Meltwater from the glacier flows into Jökulsá á Fjöllum, the second longest river in Iceland.