Assessment irregularities are corrupt and unethical activities introduced in determination of learner's outcome. Assessment irregularities refer to all corrupt and unethical activities introduced by teachers in determining the abilities of the learner. The study analyzed assessment irregularities among academic staff of universities in Nigeria as perceived by their students. Relevant literature to this phenomenon indicates that the Nigerian Education is plagued by irregularities ranging from examination malpractices by students to falsification of assessment of students by their teachers. The design adopted for this study was survey. The sample was made up of 450 students from two public universities (one federal owned and the other state owned) in the country. Stratified and purposive sampling techniques were used to select the sample. The instrument used for data collection was a checklist designed by the researchers and titled Assessment Irregularity Scale (AIS). Cronbach alpha reliability coefficient of the instrument was .81. Results of the study showed that student's perceived assessment irregularities among academic staff are high for most items. The results also showed that place of residence, attitude towards school and self concept influenced students' perceptions about irregularities of their lecturers. Based on the findings, it was recommended that there should be wide training of university teachers, on periodic basis, in order to equip them with testing skills and modern assessment practices.

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