The study investigated the Application of Internet for service delivery in some selected special libraries in Kaduna state. The objectives of the study were to ascertain the kind of Internet services used in the special libraries; to ascertain the library services where internet is applied; to find out the extent of internet application in library services; to ascertain the level of satisfaction of the staff with the application of the Internet and to determine the factors that hinder the effective application of Internet in the libraries. Five (5) research questions were raised viz: what kind of Internet services are used in the libraries? what library services are internet applied for? What is the extent of application of Internet to library services? How satisfied are librarians with the application of internet in the library service? and what are the factors militating against the effective application of Internet in the special libraries in Kaduna metropolis. Survey method of research was adopted. The population of the study was made up of 53 library staff from the six (6) selected special libraries. Purposive sampling was used. Structured questionnaire and semi-structured questionnaire and observation were the instruments used to collect data for the study. Descriptive statistical tools such as simple percentages and tables were used to analyze the data. The study found out that internet services is applied in most of the library services of the selected libraries. The findings also revealed that internet is applied to a large extent in most of the library services for effective service delivery. The study also found out that the librarians derive satisfaction in the application of Internet in their library services because it helps for effective services delivery, though some factors were discovered to be a hindrance for effective application of the Internet in the special libraries which include: low bandwidth; poor funding; erratic power supply and lack of maintenance culture. The study recommends that there should be adequate planning and survey by the libraries before the introduction of Internet in order to cope with the frequent change in information technologies; that management should ensure librarians participation in ICT training programmes to beef up their Internet learning skills; that the selected libraries should acquire state of the art power generating set to augment the services of the Power Holding Company of Nigeria; that budgetary allocation to the libraries should be increased etc. The study concludes that special libraries in Kaduna metropolis are still on the verge of meeting up with the global perspective of ICT compliance. This notwithstanding, the Internet services are available in such a way that libraries can apply them to library service to enhance the quality of their service delivery.