Lnáře (German: Schlüsselburg) is a municipality and village in Strakonice District in the South Bohemian Region of the Czech Republic.

It refers to a key worn in coat of arms of the noble family of Schlüsselberg who probably founded the local aristocratic residence.

The built-up area is situated on the shores of three fishponds, connected by the Lomnice River (here also called Smolivecký potok): Veský, Zámecký and Podhájský.

The fourth large pond, located in the southern part of the municipal territory, is Nový.

The representative rooms of the castle are richly decorated with wall and ceiling frescoes with scenes from ancient mythology.

[9] Other sights include the monastery of the Discalced Augustinians founded in 1684 by the Church of the Holy Trinity.