This paper describes the first confirmed case of ryegrass staggers in horses from a riding school in Belgium. Duringthe last days of February 2007 about thirty horses showed variable neurological symptoms, such as anxiety,muscle fasciculations, hypermetria and ataxia. The diagnosis of ryegrass staggers was made based on the clinicalsymptoms, the anamnesis which stated that perennial ryegrass hay imported from France had been fed to theanimals since a few days, and on the demonstration of a high lolitrem concentration in the hay. No horses dieddespite of the high morbidity: all horses recovered completely three days after withdrawal of the hay.