This study examined the influence of subscribed online databases usage on the academic activities of postgraduate students of Umaru Musa Yar‟adua University, Katsina. In order to achieve this, six research objectives were raised. These are to determine subscribed online databases available for the academic activities of postgraduate students in the Umaru Musa Yar‟adua University Library, to determine influence of subscribed online databases on academic activities of postgraduate students of Umaru Musa Yar‟adua University, to find out challenges of utilization of the subscribed online databases by the postgraduate students of Umaru Musa Yar‟adua University. Quantitative research method and survey research design were adopted. The population was 742; this included 739 postgraduate students and three (3) library ICT staff. Two hundred and fifty-three (253) postgraduate students were sampled out and three (3) ICT staff were all used. Data collected were analyzed using frequency, percentage, mean and standard deviation. Findings show that four subscribed online databases were available for use; namely ScienceDirect, Jstor, SpringerLink and EBCOhost databases. Use of subscribed online databases influenced quality of the students‟ research and acceptance of researches in world class journals. It was discovered that challenges hindering postgraduate students from effective use of subscribed online databases were difficulty in retrieving accurate search result, online ads pop up and low internet bandwidth. It was concluded that the subscribed online databases available in Umaru Musa Yar‟adua University Library are relevant and influence academic activities of postgraduate students. The researcher recommended among others that more specialized subscribed online databases need to be made available; Seminars, workshops and conferences should be organized to educate users on how subscribed online databases would influence their performance in examination; ICT staff of the Library should ensure that every postgraduate student is acquainted with search strategy skills and general ICT competencies.