This study investigated the application of modern technologies in the security of library resources at Bayelsa State Library Board (BYSLB). The study was prompted by a seemingly ineffective security method which has led to the loss of information resources, and the rarity of the resources. Three objectives and three research questions guided the study, and three research hypotheses were formulated and tested at a 0.05 level of significance. The study was carried out using correlation research designs, with a population of 24, comprising professional, paraprofessionals and supporting staff. A census sampling technique was used to select all the respondents. A questionnaire was used for data collection and a total of 24 copies were administered, but only 21 copies were found valid for analysis. The data was analyzed using the mean score and standard deviation for research questions and Pearson Product Moment Correlation to test the hypotheses. The study revealed that although the application of modern technologies such as Radio Frequency Identification (RFID), barcode, Close Circuit Television (CCTV), and corrective and deterrent control were not fully adopted, there is a significant relationship between RFID/Barcode, CCTV technologies, corrective and deterrent control, and the security of library resources in BYSLB. The study recommended, among others, that funding from the private sector, training, and retraining of library staff as specialists in providing security of library resources.