The study investigated teachers’ perception of library environment, availability and utilisation of information resources on their academic activities in Unity Colleges in Federal Capital Territory (FCT), Abuja, Nigeria. Four research questions guided the study. Survey research designed was used with the target population of 4233 teachers in six Unity Colleges within the four area councils in FCT, Abuja. Proportionate stratified sampling techniques was used to select 351 teachers. Four-point rating scale questionnaire was validated and pilot tested giving a reliability coefficient of 0.97.  Out of 351 copies of questionnaire administered, 261 copies were filled, retrieved and found usable for descriptive analysis of frequency counts, percentages, mean and standard deviation. Results showed both individual and combined perception of the positive influence of library environment, availability and utilisation of information resources on academic activities of teachers in Unity Colleges in  FCT Abuja. The study concluded that, with conducive library environment and adequate information resources, teachers would efficiently and effectively access and use information resources to pursue their academic activities in Unity Colleges within the territory. The study proffered practical recommendations to the Federal Ministry of Education as well as the authorities of Unity Colleges in FCTAbuja. These include  provision, integration and use of inclusive collection as well as establishment of collaboration and partnership with other relevant bodies/organisations and sister unity colleges in Nigeria.