Modern technologies are part of the tools that can help to provide efficient and effective service delivery in libraries. For librarians to perform their jobs effectively, they have to fully utilize modern technologies. The aim of the study therefore, is to examine the utilization of modern technologies for effective service delivery in selected special libraries in South-East, Nigeria. Specifically, two objectives and two research questions guided the study .The study adopted descriptive survey design. Responses to a structured questionnaire developed by the researchers were received from 30 librarians. The questionnaire was entitled,’ Utilization of Modern Technology for Effective Service Delivery Questionnaire(UMTSLCQ). It was validated by experts and its reliability index was calculated as 2.50 using frequency table. The data collected were presented in a tabular form for clarity, analyzed using frequency count and tables. The findings of the study showed that modern technologies are not being utilized adequately in service delivery in most special libraries in the south east, although they complement many of the services provided by the special libraries. Recommendations were made based on the findings which includes proper sensitization of librarians on appropriate use of modern technologies, adequate funding, consistent and constant training of staff to upgrade their skill on the use of modern technologies. The study concluded by making recommendation based on the findings.Keywords: Modern technology, Utilization, Service delivery, Special Libraries, South-East Nigeria