Bois du Petit-Château, Public park and zoo in La Chaux-de-Fonds, Switzerland.

Bois du Petit-Château is a park with woodland areas and animal enclosures spread across its grounds in La Chaux-de-Fonds. The space combines walking paths through trees with designated areas where visitors can view the animals housed there.

In 1889 the Société d'embellissement bought the Bois du Petit-Château grounds above the town's northern edge from the shooting society Les Armes-Réunies and had landscape gardener Charles Mattern lay out a public park. The municipality received it by deed of donation in 1891 and took over its upkeep. Animals were added gradually, reaching about a hundred by 1940; in 1974, with nearly 600 animals, it became a professional zoo of regional fauna. The natural history museum, begun in 1845, joined the zoo and vivarium in 1998 as the Institutions zoologiques, renamed MUZOO in 2022.

The park's name comes from the small castle that once stood on the site. Since 1891 it has been a free public park; the animal enclosures grew from a few deer and birds into a zoo. The vivarium, founded in 1969 and moved here in 1989, displays reptiles and amphibians.

The park is accessible daily and offers open paths for walking, though some areas can become muddy in wet conditions. Good footwear and weather protection are recommended, especially if you plan to spend extended time exploring the grounds.

The site operates a care center for injured wildlife from the region, actively supporting local animal species. This work happens behind the scenes while visitors enjoy the park.