From the affirmative that the Library is important because it is an essential part of knowledge and that the Specialized University Library of a Teaching Institution must contain bibliographical material to support the disciplines within the studies they have to offer; we have elaborated an users study which includes individuals that are not registered as regular students at the Institution. The objectives of it have been directed to the users, characterization, issues of search, and the use of information and opinions about the Library. The instrument that has been used was a questionnaire containing subjectives and objectives questions. The results have demonstrated that the objectives proposed were attained. We have also presented analized comments about the opinions given by the users. We have reached the conclusion that studies of such kind should be elaborated and evaluated regarding the necessity of the user / informations in the different existing Libraries.