The rice root-knot nematode (RRKN), Meloidogyne graminicola, is a potent nematode pest of rice in upland and direct-sown, medium-land rice ecosystems. During the last decade, its occurrence in epidemic proportions over hundreds of acres in India and the Philippines raised concern. Chemical and cultural control methods are inefficient due to its subterranean habitat, internal feeding and polyphagous nature. The indica rice cv. Ramakrishna (a derivative of TKM6) showed continuous resistance/tolerance against RRKN in our studies. We developed an F₉ recombinant inbred mapping population of the cross Annapurna x Ramakrishna to map the RRKN resistant gene(s) and develop molecular markers for use in marker assisted breeding. Three traits, mean no. of galls, eggs and eggs/gram root produced by RRKN 45 days after inoculation, were used to score resistance/susceptibility of the plants in the mapping population. The traits were highly correlated. Analysis of phenotypic and genotypic data suggested, the existence of three quantitative trait loci (QTLs) i.e qMg-1, qMg-3a and qMg-3b for RRKN resistance in rice cv. Ramakrishna. qMg-3a, on chromosome 3, is a major QTL reducing production of eggs by up to 41.10 percent.