The paper examined the extent to which motivation predicts organisational citizenship behaviour of academics in universities in Akwa Ibom State, Nigeria. Three research questions were raised to guide the study while three null hypotheses were tested at .05 alpha level of significance. Ex-post facto design was adopted for the study. Population of the study comprised all the 1856 academics in public universities in Akwa Ibom State. A sample size of 464 academics was drawn from the population using hat and draw method. "Motivation and Organisational Citizenship Behaviour Questionnaire" (MOCBQ) used for data collection was validated by three validates from University of Uyo .Using Cronbach's alpha statistical tool, the test of internal consistency of the instrument yielded the coefficients of .83 for Motivation and .97 for Organisational Citizenship Behaviour. Data were analysed using simple linear regression statistics. The finding is that motivation significantly predicts organisational citizenship behaviour - altruism, sportsmanship and civic virtue - of academics of universities in Akwa Ibom State, Nigeria. Based on the findings, it is concluded that motivation could be used to explain the variation in organisational citizenship behaviour of academics in universities. It is, therefore, recommended that university authorities should explore various motivation strategies and create supportive environment for achievement, personal growth, responsibility and cross training of academics to enhance their exhibition of organisational citizenship behaviour.