This study was conducted to determine factors affecting job performance of agricultural extension workers (AEWs) at Handeni District, Tanga Region. Specifically the study aimed at assessing the job performance of extension staff working under the public and private sector, identifying personal factors of extension staff that affect job performance, determining the relationship between the level of logistic support and the job performance, determining the relationship between the volume of work and the performance of agricultural extension workers and the relationship between perception of job satisfaction and job performance of agricultural extension workers. Using a cross sectional research design a sample of 72 AEWs were randomly selected for the study using self- administered questionnaire. It was also observed that 55.0% of AEWs with certificate qualifications have higher job performance than those with higher level of education in the public sector. There was low level of logistic support to the AEWs working in Handeni District. Moreover, there was higher proportion of AEWs with low volume of work in the public sector compared to those in the private sector. The study showed that the volume of work had a significant influence of AEWs on job performance both in the public and private sectors. The results also indicated that most AEWs in the private sector have negative perception on job satisfaction. In the public sector there was significant relationship (p<0.001) between the perceptions of AEWs and job satisfaction. The AEWs with positive perception on the job satisfaction have higher job performance compared to those with a negative perception. It was observed that the AEWs working in the public sector were more knowledgeable than those working in the private sector. This study recommends that the government provides more support to newly employed public AEWs to establish more demonstration plots as that can motivate them and simplify the whole process of knowledge transfer to farmers.husband Dr. Ernest Rashid Mbega