The patron of Leggiuno is Saint Stephen, celebrated on 26 December in the Church of Santo Stefano Protomartire.
The town hosts the Farmer's Fair and the Alborellata, with alborelle fish caught in Lake Maggiore, as well as the Nuotata dell'Eremo, a charity swim across the lake from Stresa to Reno di Leggiuno. In December, the Luci di Leggiuno, a Christmas-themed light installation, is lit. The town also holds the famous Hermitage of Santa Caterina del Sasso.