This study was aimed at determining the levels of and the relationships between role conflict, role ambiguity and job satisfaction experienced by staff and line middle level managers of manufacturing establishments in Nigeria. The scope of the study was all the staff and line middle level managers in some large and medium manufacturing establishments in Nigeria. Chapter one dealt with such topics as the problem statement, justification and objectives of the study. The review of literature covers such authors as Rizzo et al (1970), Biddlc and Thomas 1966), Bobbitt et al (1978) etc. The various contributions they made to the study of and the understanding of the three variables (Role Conflict, Role Ambiguity and Job Satisfaction) were examined. The research methodology was mainly by the use of structured questionnaires drawn out on a five point Likert Scale. A sample size of 278 persons (as recommended by Krejcic and Morgan 1970) was randomly determined from a population of 964 Production and Personnel Managers in the 482 medium and large scale manufacturing establishments (Manufacturer's Association of Nigeria, 1994). The findings revealed among others that : The respondents did not indicate any significant differences in their experience of role ambiguity. They did not also show any significant