This article presents a tool for the reuse of use case diagrams by storing their information in OWL ontology and the use of Semantic Web technologies. Software reuse is defined as the use on a new project of any artifact created before. This practice has significant benefits in reducing costs and increasing quality and productivity in software development. Numerous approaches have been proposed aimed mostly at the source code reuse, but this type of reuse has its limitations because development platforms and technologies are constantly changing. It is necessary to apply reuse over software artifacts created at higher levels of software life cycle such as requirements specification.