The orientations of NiO formed on evaporated Ni single-crystal films with surfaces parallel to (110), (001), or (111) have been studied by means of electron diffraction. Beside that the parallel orientation relationship already known to exist between NiO and Ni has been confirmed, the following NiO textures have been found in the present investigation: texture: (111)NiO// (001)Ni, NiO// Ni; fibre texture: NiO//Ni. It was shown that NiO//(110>Ni is common to all orientation relationships between NiO and Ni, thus making it clear that the close-packed direction plays an important role in the epitaxial growth of f.c.c. crystals. The various trends of epitaxial growth of NiO are discussed with respect to the number of directions on the film surface and to the degree of perfection of Ni films.