The general objective of the study is to analyse the socio- economic determinants of commercialization among small holder farmers in Abia state, Nigeria. The specific objectives of the study are to: examine the level of commercialization among the farmers; estimate the determinants of commercialization among the small holder farmers in the study area; and make recommendations based on the findings. A multi-stage sampling technique was adopted for this study, leading to the selection of one hundred and eighty (180) farmers / respondents. Primary source of data was used for the study. This was actualized with questionnaire administered to the already selected respondents. Household commercialization index (HCI) and multiple regression were employed in analyzing the data. The result of the commercialization index showed that none of the crops studied attained a ratio above 30 percent. Cassava had the highest ratio of 29.58 percent, while water yam was the least with 13.55 percent. The coefficient of household size, income, farming experience, farm size, distance to market, membership of society and access to credits, were all significant at various probability levels and with different signs in influencing commercialization in the study area. It is therefore recommended that markets should be created where none exist. Support to facilities in storage, business management, capacity building, packing and processing should be provided. Furthermore, interlocked transaction institutional arrangement model is recommended.