Uan Tabu is a rockshelter on the left bank of the central valley of the Wadi Teshuinat, which is a main ancient water course in the Tadrart Acacus mountain range. It is located in the Fezzan region, south-western Libya (Great Jamahirya). The site was discovered by Fabrizio Mori in 1960 and was re-excavated and studied by a multi-disciplinary team at the beginning of the 1990s. It has also remarkable rock art that includes paintings from the Round Head and Pastoral phases. Between 1960 and 1963, a trench was dug into the archaeological deposit at the foot of the rock wall. The results of the 1960s’ excavation have never been published before, apart from some brief notes. They are thoroughly described and discussed in the present volume. Between 1990 and 1993, the excavation was resumed and extended. The 1990s’ excavation has been preliminarily published. Further information and details are now presented and commented. A stratigraphic and cultural correlation between the two excavations is also attempted in this volume. Four main archaeological and paedological units were identified and dated. They spanned from the Late Pleistocene to the Late Holocene. The earliest one, dating to the Pleistocene, included an Aterian techno-complex and was dated to around 61,000 years BP. Later, during the Early Holocene, a ‘pre-pastoral’ occupation occurred since the 10th millennium bp. This period was differentiated in two phases characterised by different socio-cultural systems: 1. during the Early Acacus (around 9800-8800 years bp), the site was used on a seasonal basis, probably during the dry season, for practising hunting activities; 2. during the Late Acacus (around 8800-8600 years bp), a more sedentary lifestyle was hypothesised for the inhabitants of the site. These two cultural facies comprised the upper three units. The fourth phase of occupation of the shelter was only attested to the surface of the site, but it could be still considered as an indication of the use of the site during the Late Holocene, as late as the 4th millennium bp. A dung fill in the wall of the rockshelter dated to the end of this, Late Pastoral, phase and is the only evidence for domesticated animals.