The Festetics Palace is a Baroque palace located in the town of Keszthely, Zala, Hungary. The building now houses the Helikon Palace Museum.

The palace’s construction, started by Kristóf Festetics in 1745, lasted more than a century. During this time, the palace, built at first on the foundations of a ruined castle, was tripled in size in two subsequent building campaigns, most recently in the 1880s, to designs by Viktor Rumpelmayer, living in Vienna.

Unlike the surrounding area, the palace was not damaged during World War II. The palace has housed an independent museum (Helikon Palace Museum) since 1974; it is visited by 200,000 people each year.

The parterres in which the palace stands were extended in the nineteenth century with a naturalistic landscape park in the English fashion. Open-air concerts are held on the grounds during the summer. The stable block now houses a collection of coaches and carriages.