Organic farming as a sustainable agricultural approach is a growing concept in South West Nigeria. This study investigated the attitude of vegetable farmers toward organic agriculture practices in South West Nigeria and the determinants of their attitude. Cluster sampling was used to select 315 farmers from list obtained from the farmers’ cooperative societies. Farmers were interviewed in person. Attitude was measured as a pooled score of respondents’ responses to 25 positive and negative statements made on a five point Likert scale. Data was analysed using frequency counts, percentages, means and a probit regression model. A majority of the farmers had positive attitude toward organic agriculture practices. The most important attitudinal statement ranked by the farmers was that organic agriculture strengthens the use of indigenous knowledge (4.55). The results of the probit model revealed that farm size, farming experience, household size, membership of organization and sources of information (t = 0254, 0.089, 0.125,0.694, 0.021, p<0.01) respectively showed a positive relationship with attitude toward organic farming practices. Therefore, there is need for effective linkage of research systems with extension services on relevant organic practices, as a build up to traditional farming, adaptable and sustainable to local conditions of vegetable farmers. Key words: Organic agriculture, vegetable farmers, attitude, linkage, South West Nigeria.