The Scientific Collection of Arachnids of the Natural History Museum of the Federal University of Bahia (MHNBA) had its first record in October 1982 by a scorpion specimen (Bothriurus asper) collected in the Ecological Station of Raso da Catarina, Jeremoabo county, Bahia. Since then, the collection had a significant increase. Currently, it has about 7,000 specimens (4,140 spiders and scorpions 3,259 and 74 smaller groups). Among the spiders were identified 38 families, 94 genera and 5 species. Among scorpions, 3 families, 10 genera and 42 species. They came from catches made by teams involved in scientific research projects and/or donated by the local community. Their data are contained in a special book collection, major of them are informatized in Excel database. The collection also includes animals from other parts of Brazil, most of the Northeast region, and from other countries like scorpions specimens from Uruguay. In addition, there are paratypes used in the description of Tityus aba and Phoneutria bahiensis, both endemic of Bahia.