Forster Linde, Natural monument in Aachen-Mitte, Germany.

The Forster Linde is a large lime tree in Aachen-Mitte with a trunk base measuring roughly 9.5 meters in circumference and five major offshoots branching from the main stem. The tree displays a distinctive growth pattern created by the division of its original trunk.

In 1852, Prince Hermann von Pückler-Muskau visited the tree and estimated its age at more than 800 years, though the exact age cannot be determined. The five stems growing from the trunk base are about 300 years old; they emerged after the original main trunk broke out in the crown centre. In the post-war years, a concrete plug was placed there to fill the cavities.

The tree is a winter lime. Its setting beside a restored Schöffenhaus and the nearby field name Galgenplai suggest it served as a court lime, where judgments were pronounced. A stylised lime appears on the recorded coat of arms of an 18th-century Forst marksman who lived in the courthouse by the tree.

The Forster Linde stands in the Aachen-Forst district, surrounded by a kindergarten, a church and a restored Schöffenhaus. Fences enclose the tree, and ropes connect its head shoots for stability. The Städtische Katholische Grundschule Forster Linde is nearby.

A lime tree appears in the surviving coat of arms of an 18th-century Forst marksman who lived in the court house beside the tree. The nearby old field name Galgenplai, meaning gallows place, supports the idea that the tree once served as a court lime.