Ose Dudu - Traditional Soap in Yorubaland is a veritable documentation on popular "black soap" in Yoruba land. Ose Du du, the age long famous soap for various domestic uses is, no doubt, speedily going into extinction. The combined forces of globalisation, civilisation and modernisation are teaming up to snuff out its life. In this dispensation, the youths and the elites abhor Qse Dudu like vermin. "Imported" religions do not also help matters. The adherents of foreign religions regard Ose Dudu as anti-spiritual. This socio-religious factors are nothing but misconstructions because Ose Dudu is not only effective for all kinds of washing, it also has medicinal and therapeutic effects. This publication: Ose Dudu - Traditional Soap in Yorubaland is highly beneficial in that it details the production processes and the value of this ancient product to users. It is therefore a source of information to all, both the informed, misinformed and uninformed; and a very useful companion to students, scholars and researchers. This publication will also go a long way to sustain the existence of the product and promote it to users and potential users.