Eulachhallen, Indoor arena in Winterthur, Switzerland.

Eulachhallen consists of two event halls on Wartstrasse in Winterthur. Hall 1, built in 1971, covers 2,420 m² and holds up to 3,200 people; Hall 2, completed in 1998, covers 2,780 m² and holds up to 3,000. Together they form the city's largest multifunctional event venue, with a seminar room, foyer, kitchen, bistro and restaurant.

Halle 1 was built in 1971 and served mainly for handball and trade fairs until 2018. A second hall for events was completed at the end of 1998. In spring and summer 2020 Halle 1 was comprehensively rebuilt and modernised, and since completion in September 2020 the two halls form Winterthur's largest multifunctional event location.

The halls are home to the handball clubs Pfadi Winterthur and Yellow Winterthur, and the name comes from the Eulach stream nearby. Trade fairs such as the Winti Mäss, WOHGA and the Swiss dog fair HUND recur here, alongside company meetings and graduation ceremonies.

The location is easily accessible by public transportation and offers ample parking for visitors. Arriving early on event days helps you secure convenient parking and smooth entry to the venue.

At the 2007 UCI Indoor Cycling World Championships in the hall, a record 3,280 spectators were counted. The heavy metal band Iron Maiden played a concert here on 2 October 1998 during its Virtual XI World Tour. In 2008 the venue hosted the finals of the men's and women's EuroFloorball Cup.