This study examined the knowledge and perception of farmers regarding privatization and commercialization of agricultural extension services in Delta State, Nigeria. A sample size of 90 farmers in contact with extension agents was randomly selected for the study. Data for the study was collected through the use of a validated structured interview schedule. Both descriptive and inferential statistics were used in analyzing data generated from the study. Results show that respondents had a low to moderate knowledge regarding the concept, principles and objectives of privatization and commercialization. Respondents also had a favorable perception towards privatization and commercialization of agricultural extension services. There was no significant difference in the perceptions of small, medium and large-scale farmers. The study concludes that the favorable perception held by the respondents is an indication of their willingness to accept the introduction of privatization and commercialization in agricultural extension services delivery. It therefore recommends that the government of Delta State should consider privatizing and/or commercializing agricultural extension services in the state. [Ajieh Patrick Chuks. Farmers’ Knowledge and Perception regarding Privatization and Commercialization of Agricultural Extension Services in Delta State, Nigeria. International Journal of Agricultural Science, Research and Technology in Extension and Education Systems, 2012; 2(4):175-179].