Thielpark, Garden monument in Dahlem, Germany.

Thielpark is a garden monument in Dahlem spanning approximately 10 hectares, with multiple ponds like Schilfteich and Thielparkteich connected by winding pathways and stone walls. The natural hillside landscape shapes the park's character throughout.

Around 1901 the Prussian Landtag began converting farmland around Berlin into building land and set up a division commission chaired by Hugo Thiel, a ministerial director in the Prussian agriculture ministry. Thiel judged the hilly ground with its steep slopes and hollows hard to sell, so he designated it as a park while the surrounding villa plots were laid out.

The park is named after Hugo Thiel, the Prussian ministerial director who chaired the commission dividing the Dahlem domain and set the hilly land aside as a park around 1901. The Tagesspiegel writer Jan Schulz-Ojala called it a "filigree green fibre". The Jesus-Christus-Kirche Dahlem stands directly beside the park.

The park is near the Thielplatz U-Bahn station on Line U3, with numerous benches positioned to face south. Multiple pathways run through it, connecting easily to Clayallee and Dahlem's center.

In the Schwarzen Grund lies the Thielstein, Berlin's largest glacial erratic: 50 tonnes, ten metres in circumference, protected as a natural monument. It was found while the Freie Universität (Thielplatz) U-Bahn station was being built and took 14 days to haul about 40 metres out of the excavation pit with cable winches.