Late-Svecofennian deformation was investigated in the Bjensböle area of SW Finland. The deformation history was revealed by following marker horizons of amphibolite, marble and black schist, in addition to microscopic studies and U-Pb monazite geochronology. The D₁ structures are transposed and overprinted by D₂ structures. The mesoscopic F₂ folds are tight to isoclinal with fold axes plunging 20-40°NE-ENE. Regional large-scale open F₃ folds formed during the main D₃ phase, and the macroscopic structure in Bjensböle is an F₂-F₃ interference pattern formed by N-S compression. The area consist of low P/high T amphibolite facies sillimanite gneiss and low P/low T amphibolite facies quartz schist, separated by a low P/low T amphibolite horizon in the central part of the area. The sillimanite gneiss yielded a U-Pb monazite age of 1824±5 Ma. This age gives a timing for the peak metamorphism and the D₃ folding on the Kemiö Island. After the peak metamorphism some deformational structures developed. A NE-SW directed crenulation cleavage in the quartz schist and the amphibolite, small open folds in the marble, a foliation in the sillimanite gneiss and a muscovite orientation in the quartz schist all have the same direction. These structures are interpreted as late-stage D₃ (D_3L). The angle between the NE-SW directed D_3L structures and the locally predominant S₀ + S₁ + S₂ schistosity is ca. 25°. The structural evidence related to the D_3L point to a dextral sense of shearing along roughly E-W directed zones with a NW-SE compression. This is related to a regional ductile shearing signifying the vaning stages of the late-Svecofennian transpressive deformation in SW Finland.