In northern Slovenia (Yugoslavia, λ = 15° E, ϑ = 46° N), 41 sites of Permo-Triassic red sandstones and volcanic rocks have been sampled for a palaeomagnetic study. The rock units are situated either in the Southern Alps or in the transition zone between the Southern Alps and the Dinarides. More than half of the sampled sites revealed that the primary remanence was seriously affected by partial or entire magnetic overprint in connection with the Alpine orogeny. This was manifested by either too steep inclinations, or too weak or inconsistent and unstable remanence. Only fourteen sites revealed the typical flat inclinations of Permo-Triassic rocks. A group of six sites in northwestern Slovenia (west of Ljubljana) gave a remanence direction ( N = 6, R = 5.431, D = 151.4°, I = −11.4°, k = 8.8, α 95 = 19.3°) which is in agreement with the mean Permian remanence direction of the Bolzano Rhyolites in the Italian part of the Southern Alps ( D = 148°, I = −20°, after Zijderveld and Van der Voo, 1973), indicating that this zone is still part of the Adriatic plate. However, a group of eight sites in northeastern Slovenia (east of Ljubljana) has a remanence direction ( N = 8, R = 6.991, D = 225.9°, I = −15.0°, k = 6.9, α 95 = 18.8°) which is more in agreement with the central European Permo-Triassic direction of remanence ( D = 204°, I = − 14°). It is therefore concluded that the eastern margin of the Adriatic Plate crosses the region of Ljubljana in an approximately north-south direction.