Technical Abstract: A linkage map for European hazelnut (Corylus avellana L., 2n = 2x = 22) was constructed using a population of 144 seedlings from a cross of OSU 252.146 x OSU 414.062. The male parent is heterozygous for a dominant gene that confers resistance to eastern filbert blight caused by Anisogramma anomala, and about 50% of the seedlings are resistant. A total of 1400 decamer primers were screened using template DNA of 8 genotypes: resistant parent OSU 414.062, susceptible parent OSU 252.146, three resistant seedlings, and three susceptible seedlings. Primers that generated easily-scored polymorphic bands that appeared to segregate in a 1:1 ratio were identified and used to amplify DNA of all seedlings in the population. The map for the resistant parent consists of 245 loci placed in 9 groups and spans a total of 583 cM. The map for the susceptible parent consists of 189 loci placed in 11 groups and spans a total of 599 cM. Many individual markers and small groups have not yet been assigned to a linkage group. As additional loci are scored and added to the map, we expect them to merge with the larger linkage groups and form the expected number of 11 groups for each parent. An additional 120 markers that segregate 3:1 have been scored but not yet placed on the map. These will allow identification of the corresponding groups in the two parents.