Cell structure of the hypothalamic preoptic region in goose has been studied and topographical relations of the following nuclei (n.) are shown: n. preopticus rostralis, n. preopticus periventricularis, n. preopticus medialis, n. supraopticus, n. suprachiasmaticus, n. preopticus lateralis, n. magnocellularis preopticus, n. rostralis hypothalami, n. supraopticus caudalis, n. decussationis supraopticae dorsalis and n. decussationis supraopticae ventralis. The nomenclature given in Nomina anatomica avium (Breazile 1979) has been used, as for as possible.