Botanischer Garten Loismann, Private botanical garden in Ibbenbüren, Germany.

Botanischer Garten Loismann is a private botanical garden south of the Dortmund-Ems Canal, displaying over one hectare of evergreen conifers, exotic trees, climbing plants, and medicinal specimens. The plantings are organized systematically with scientific nomenclature throughout the space.

In 1898, a farmer named Loismann started planting fruit trees on excavated material from the Dortmund-Ems Canal construction. This initial planting gradually developed into the botanical garden visible today.

Bernhard Loismann labelled the trees and shrubs he planted with their botanical names and short notes on their origin and particular features. The garden also once held a thatched garden arbour known as a "Negerhütte", a name that referred to its simple straw roof and is no longer used; the structure itself has not survived. Wooden shelter huts stand on the hill at the entrance, and numerous benches invite visitors to sit.

The garden lies directly on the eastern bank of the Dortmund-Ems Canal, with Loismannweg to the south and Löchtweg to the east. It is publicly accessible and free of charge. A wooden shelter hut stands on the hill at the entrance, and numerous benches invite visitors to sit. The Dörenther Mühlenbach is dammed into a still pond in the southern part of the grounds.

Water for the plants travels a long distance: the original owner installed a 1.5-kilometer water pipeline from the Teutoburg Forest. This historic pipeline continues to supply fresh water to the garden today.