Gornja Radgona Castle, Medieval castle in Gornja Radgona, Slovenia

Gornja Radgona Castle is a massive irregular three-story four-winged building on a hill above the Mura River in Gornja Radgona, Slovenia. Its medieval core was altered in the 16th and 18th centuries, and the inner courtyard has Renaissance pillar arcades. A lower two-story outer courtyard lies to the west; the west entrance portal bears the Herberstein coat of arms and the year 1775, and the portal to the outer courtyard shows the combined Herberstein-Eggenberg arms.

The fortress was constructed in the late 1100s and quickly developed into one of the region's major territorial holdings. Its control over numerous surrounding settlements and lands established it as a significant power center at the boundary between historical regions.

The castle is sometimes called Ratigoj Castle, alongside its Slovene name Grad Gornja Radgona and German name Schloss Oberradkersburg. Since 1992 it has been privately leased and now serves as a private museum and event venue, so its halls host exhibitions and gatherings rather than weddings.

The castle stands on a hill above the Mura River in Gornja Radgona, and the town grew at the foot of that hill, so the climb starts from the centre. The main building is a three-storey quadrangle with a lower two-storey outer courtyard on its west side; the entrance portal there carries the Herberstein coat of arms and the year 1775. A ramp leads from the outer courtyard to the portal of the quadrangle, which bears the combined Herberstein-Eggenberg arms.

The west portal of the four-winged block carries the Herberstein coat of arms and the year 1775, while the gateway to the outer courtyard shows the combined Herberstein-Eggenberg arms. Nothing of the former interior furnishings survives, so the carved stone heraldry is what remains to be read on the building.