Kollóttadyngja is a shield volcano in the Ódáðahraun lava-field in Iceland. Its height reaches 1,177 metres, and it has a diameter of 6-7 km. The summit crater is 800 metres in diameter, but only about 20-30 metres deep. In its centre, there is a bowl about 150 metres in diameter with a depth of about 60-70 metres.