The use of information resources and services provided in the Library is paramount to undergraduates’ educational activities. However, low use of information resources and services have been presumed among undergraduates hence the study examined the use of information resources and services among undergraduates in Ibadan Library School. The study population consisted of 144 undergraduates in the Ibadan Library School. Total enumeration was used. Questionnaire and interview guide were used for data collection and the data was analysed using descriptive statistics. The findings revealed that undergraduates use the library more during examination periods and hardly use the library outside examination periods. Respondents stated that they use the library information resources and services for assignments 95.1%, learning 92.6%, examination purposes 89.3%, class preparations 86.9% and for self-development, 86.1%. Poor Internet connectivity, small reading space, and epileptic power supply were the major challenges encountered in the use of information resources and services, in Ibadan Library School. To further encourage the use of information resources and services among undergraduates, the Library space should be expanded to increase the accommodating capacity of the library. the Library should employ more qualified hands to run shifts and reduce work overload on the few staff present in the library, also the Library should organise seminars and workshops to enlighten the undergraduates of the benefits of using the library information resources and services.