The study was conducted in Dharwad district of Karnataka where groundnut is an important oilseed crop. Primary data were collected from the sample farmers while the research data and data on demonstration plots were collected from the research stations and extension education units of the University of Agricultural Sciences, Dharwad. As revealed by the results there was sizeable total yield gap in groundnut. The magnitude of the total yield gap on large farms was compareatively less than that on small farms.The magnitude of yield gap-l was higher. The yield gap-ll on small farms was observed to be relatively large when compared to that on large farms. The perceived constraints by farmers for attaining higher yield in groundnut were, labour problem, non-availability of quality seeds, untimely and insufficient rainfall, soil problems, lack of capital and lack of technical know how.