Austurvöllur is a public square and park in Reykjavík. The square is a popular gathering place for the citizens of Reykjavík, especially during good weather for the square is surrounded by cafés on Vallarstræti and Pósthússtræti. It has also been a focal point of protests, as it is near the Parliament of Iceland.

The square contains a large statue of Jón Sigurðsson, a leader of Iceland's independence movement.

Austurvöllur is surrounded by Vallarstræti, Pósthússtræti, Kirkjustræti and Thorvaldsensstræti. The last of these is named after Bertel Thorvaldsen, a statue of whom that was, for a long time, present in the centre of Austurvöllur, now occupied by a statue of Jón Sigurðsson. Located around the perimeter of the square are: Alþingishúsið (the Parliament House), Dómkirkjan (the city's oldest church), the Hotel Borg, as well as numerous cafés, restaurants and bars.