Batterie de Sermenaz, Military fortification in Neyron, France.

Batterie de Sermenaz is a roofless stone and concrete fortification on the Sermenaz plateau in Neyron, built in 1878–1879 as part of Lyon's second defensive belt. Its walled courtyard has a light rough-stone left wall with a rectangular opening and a small arched niche, a gray concrete right wall with green graffiti, and a rear wall of light blocks with two tall window openings flanking a central doorway. Grass covers the ground.

Built from 1878 to 1879, the battery formed part of Lyon's second defensive belt, covering a blind spot of the fort de Vancia. Its garrison of 75 men lived in a barracks shielded by an earth mound at the centre, and a 26-tonne powder magazine supplied the artillery. In 1943 the Camp Didier maquis stored weapons and ammunition here.

The fortification reflects how military strategy shaped the region's development and remains a symbol of France's 19th century defensive planning. People today connect with this legacy when they see how the site fits into the broader landscape of Lyon's protective ring.

The fort is deactivated and closed to the public; it generally opens for visits during the European Heritage Days. Access is on foot across the plateau of Sermenaz, so wear shoes suited to uneven ground. The surrounding forest was replanted with 500 trees between 2013 and 2019.

Since September 2020 the "Forts pour demain" initiative has planted fruit trees around the battery, distinct from the 500 trees the National Forestry Office planted in the surrounding forest between 2013 and 2019. The fort itself is set to gain a third place financed by the Fondation du patrimoine, announced in 2023.