Titanium oxide films grown on the surface of a Ni(110) single crystal have been investigated using STM, LEED and AES for Ti coverages ranging from 1 to 10 ml [1 ml of Ti is defined here as equivalent to the number of top layer Ni atoms of Ni(110)]. The oxide overlayers were prepared by vapour phase deposition of Ti followed by oxidation in 1x10 - 7 mbar O 2 at 800 K. Oxidation of Ti coverages between 1 and 10 ML results in STM images indicating the presence of two terminations coexisting on the surface. One termination consists of islands of epitaxial rutile TiO 2 (110), the second having cell parameters of 2.98+/-0.1x3.15+/-0.2 Å. The latter unit cell is consistent with TiO(001) (2.99x2.99 Å 2 ). On oxidation of higher Ti coverages (10 ml), only epitaxial rutile TiO 2 (110) islands are observed.