Morocco has a diverse bee fauna, but one that has also been relatively understudied in recent years. Here a revision of the species-rich genus Andrena is presented that reveals eleven new species for science and substantially improves our understanding of North African Andrena . From Morocco, Andrena ( Aciandrena) semiadesus Wood, sp. nov., Andrena ( Aciandrena) triangulivalvis Wood sp. nov., Andrena ( Campylogaster) sparsipunctata Wood sp. nov., Andrena ( Carandrena) hebescens Wood sp. nov., Andrena ( Cnemidandrena) niveofacies Wood sp. nov., Andrena ( incertae sedis) tenebricorpus Wood sp. nov., Andrena ( Notandrena) acutidentis Wood sp. nov., Andrena ( Poliandrena) breviceps Wood sp. nov., and Andrena ( Poliandrena) farinosoides Wood sp. nov. are described and their ecology is discussed. Andrena ( Aciandrena) astrella Warncke, 1975 is synonymised with Andrena ( Aciandrena) fulica Warncke, 1974 syn. nov. The unknown female of Andrena ( Nobandrena) ounifa Warncke, 1974, and the unknown male of Andrena ( Poliandrena) guichardi Warncke, 1980 are described. Andrena ( incertae sedis) gafsensis Wood sp. nov. from Tunisia is described due to its similarity to Andrena tenebricorpus . Andrena ( Poecilandrena) nigriclypeus Wood sp. nov. from Algeria is also described as it was collected within 10 km of the Moroccan border. A further 18 species are recorded in Morocco for the first time. Andrena ( Melandrena) nitida (Müller, 1776) and Andrena ( Notandrena) nitidiuscula Schenck, 1853 are removed from the Moroccan list due to historic problems in the application of these names to Mediterranean taxa.