This study sought to investigate secondary school teachers' knowledge and application of ICT in the teaching of physics. It investigated: physics teachers' knowledge of ICT and the academic achievement of physics students; physics teachers' accessibility to ICT facilities and the academic achievement of physics students and physics teachers' utilization of ICT facilities and academic achievement of physics students. This study was conducted in Calabar Municipality Local Government Area of Cross River State. The survey design was adopted, the target population comprised of 48 secondary schools, 107 physics teachers and 2000 physics students in SS II class in Secondary School, Calabar Municipality. The samples of the study were selected using the simple random sampling procedure. It employed questionnaires and physics achievement test (PAT) as a guide in data collection. The data collected were analyzed using Pearson Correlation. And the study showed that three variables: knowledge accessibility and utilization of ICT were related to the academic achievement of the physics students. This study recommended among others that physics teachers should make use of technology in their lessons to enhance learners understanding of concepts.