The purpose of this study was to assess the usability of the Moodle LMS at the National Institute of Transport in Tanzania. The study employed a descriptive research design that involved the use of a questionnaires and interview to collect data from 35 educators who were using the Moodle LMS. Quantitative data was analyzed using the SPSS while qualitative data involved content analysis. The study identified effectiveness, satisfaction, memorability, learnability and errors factors to be used to assess usability issues. The study revealed that educators encountered usability problems related to navigation, content, layout, interaction, feedback, help and support. The study recommends that the NIT should focus on providing a user-friendly interface, clear content, consistent layout, enhanced interaction and timely feedback to improve the usability of the Moodle LMS. By addressing these usability problems, NIT will enhance the effectiveness of teaching and learning activities. Moreover, the study recommends regular training to teachers on how to use the Moodle LMS.