During three growing seasons (2017–19), the field trials implying 18 sunflower hybrids were set up on the areas of the Agricultural Institute Osijek. The research objective was to evaluate a genotype x environment interaction pertaining to a grain yield (t/ha) and oil content (%). A genotype x environment interaction for both traits was evaluated by the AMMI (Additive Main Effects and Multiplicative Interaction) analysis. Statistically significant differences were established between the genotypes, environments, and the genotype x environment interactions concerning a grain yield, while the relatively largest proportion of sum of squares was manifested by a genotype x environment interaction (41.72%), followed by the genotype (20.75%) and the environment (2.10%). Regarding a grain yield level and stability, the genotypes 4, 10, 17 and 11 were particularly prominent. Concerning the environments, the highest grain yield and the lowest genotype x environment interaction were in 2018. Statistically significant differences between the genotypes, environments, and genotype x environment interactions were also detected concerning the oil content, while the largest proportion of sum of squares was manifested by the genotype (52.82%), followed by the environment (23.02%) and a genotype x environment interaction (17.27%). Regarding an oil content level and stability, the genotypes 8, 13, 17, 6 and 16 stood out particularly. Concerning the environments, the 2019 one had a slightly lower oil content but a considerably less genotype x environment interaction and, respectively, a higher stability in relation to other environments.