Hijiri Aviation Museum, Aviation museum in Omi, Nagano, Japan

The Hijiri Aviation Museum is an aviation museum in Omi displaying retired military aircraft and related equipment across indoor and outdoor spaces. The collection includes jets and propeller-driven planes arranged for visitors to examine up close.

Omi village opened the museum on 20 July 1965, with displays of local natural history and Buddhist statues. On 19 November 1971 an aviation pavilion opened in a former Omi elementary school building moved to the site, alongside outdoor aircraft. The facilities were renovated in April 2012.

The museum preserves natural history specimens, Buddhist artifacts, and historical records documenting the development of the Omi village community.

Visitors can explore aircraft in both indoor and outdoor sections, making it possible to see the full range of the collection in one visit. Weather plays a role in outdoor viewing, so planning your time accordingly helps you experience the whole museum.

The museum preserves a large naval gun from the battleship Mutsu and a steam locomotive built in 1943. These industrial relics offer a broader view of Japan's technological heritage beyond just aviation.