Augustinusga (West Frisian: Stynsgea) is a village in the municipality of Achtkarspelen, Friesland province, The Netherlands.

Augustinusga lies in the eastern part of the province of Friesland, 10 km north of Drachten.

[5] In 1240, Gerke Harkema from Augustinusga founded the village of Gerkesklooster.

In 1242, Huwe Harkema, his brother, founded Buweklooster [nl].

The poldermolen is a tjasker, simple pumping mill, which was originally located in Blessum and moved to Augustinusga in 1972.