Through a combination of new morpho-structural observations from field studies and satellite imagery, along with a reinterpretation of existing data, we present a reassessment of the role of late-orogenic collapse in shaping the present-day morphology of the Peloponnese (Greece). Located in the External Hellenides, the area was primarily structured by the stacking of alpine tectonic nappes since the Paleogene. From the Miocene onwards, as the underplating of crustal slivers increasingly thickened the crust, deep units began to exhume, generating local bulges in the nappe pile, with the morphology of turtle-back domes. This uplift triggered the gravitational collapse of the superficial units along low-angle detachments and toe thrusts, which reactivated the décollement layers of the alpine thrusts. These detachments are frequently encountered all along the periphery of the exhumation domes, reflecting a multi-directional collapse of the nappes, although favored in the alpine paleo-shortening direction. Superficial nappes were thus delaminated in the central Peloponnese, opening large tectonic windows that expose metamorphic rocks, while detached material accumulated at the foot of the domes. Since the Pliocene, major normal faults intersected these syn- and late-orogenic structures, giving the Peloponnese its current four-fingers morphology. These faults appear coherent with the geodetic velocity field of the last thirty years. The presence of a free boundary at the Matapan Trough and the direction of the WNW-ESE alpine structural inheritance largely drove this post-orogenic collapse of the Peloponnese toward the southwest.