The purposes of this study were: 1) to study the personal information of visitors to the Southern Agricultural Fair, 2) to study the need for agricultural knowledge of the Southern Agricultural Fair, 3) to study the affecting factors to the agricultural knowledge needs which was classified by personal information from the samples. The samples in this study were 400 people who joined the 28th Southern Agricultural Fair, Faculty of Natural Resources, Prince of Songkla University, Hatyai campus, on August 12th – 21st, 2022. The data were collected by questionnaires and analyzed by using percentage, average, standard deviation Multiple Regression Analysis to find the affecting factors for agricultural knowledge needs of the southern agricultural visitors. The results showed that the personal information factors of visitor’s knowledge needs are at a moderate level in all aspects. The affecting factors for agricultural knowledge needs of the southern agricultural visitors found that 1) the agricultural experience affecting to plant knowledge need 2) the age of visitor affecting knowledge pet need 3) the age of visitors and their agricultural experienced affecting to economic animals knowledge need 4) the age experience affecting knowledge aquatic animals for recreation need. The recommendation for this study is to hand the results of the research to those who were organizing events. It will be more beneficial to utilize the specific information to improve all in many aspects in the next coming event. To increase channels for disseminating information about organizing the exhibitions and knowledge booths. To increase channels for disseminating information about agricultural events in the South next time to make the most of the Southern Agricultural Fair.