Lónyay Mansion, Romanticism mansion in Bodrogolaszi, Hungary.

The Lónyay Mansion is a Romantic-style residence in Bodrogolaszi built around 1860 with detailed decorative elements. Its exterior walls feature ornate window and door frames characteristic of the architectural tastes of that period.

The mansion was built in the 1860s for Ödön Lónyay to plans by Miklós Ybl, under the direction of Ödön Klein. His son Elemér inherited it and used it as a summer residence with his wife, Princess Stéphanie of Belgium; the couple fled to Pannonhalma during World War II and left their estate to the Benedictine order. The building was nevertheless nationalised and housed a children's home until the regime change, then returned to the Benedictines, who in 2007 entrusted it to the Chemin Neuf community for 99 years.

The mansion's name recalls the Lónyay family: Ödön Lónyay commissioned it, and his son Elemér used it as a summer residence with his wife Stefánia, a Belgian royal princess. In the park the Chemin Neuf community laid out the Házaspárok útja, the Way of Couples, a path whose name refers to married couples.

Visits are by prior arrangement with the Chemin Neuf community, which uses the building; the park, with its Házaspárok útja (Way of Couples) laid out by the community, can be seen on foot. The mansion stands a few hundred metres from the Bodrog and about 200 m from the railway line.

The mansion lost its listed-building status because of the rebuildings carried out over the decades. In the park the Chemin Neuf community laid out the so-called Path of Married Couples, and the Lónyay estates once reached across the Bodrog to the far bank.