This article presents the work that was carried out to develop the Chilean Sign Language/ Spanish bilingual dictionary. The stages of this process are described, as well as the lexicographical challenges that were faced during its development. Some of these challenges were due to the gestural and visual nature of sign language, in which linguistic signs are made of handshapes in movement, using the tridimensional space. Through the course of its elaboration deaf persons belonging to the Chilean Deaf Community participated with different roles, which gave validity to the signs that were recorded on digital photography. This dictionary contains the lexical units that belong to the sign language used in our country, as a means of communication, mainly by members of the Deaf Community in the Metropolitan Region. This language has no written system; therefore it is transmitted only through face to face communication. In addition, general information is provided about the development of dictionaries and the different ways in which they can be arranged, and in particular, those that register sign languages. Chilean Sign Language is the most important cultural value of the Deaf Community in Chile; therefore a dictionary of this nature can contribute to its dissemination and validation as a natural language.