Corrosion-resistance of titanium metal and tribological characteristics of titanium based materials, such as titanium metal, Ti-6Al-4V alloy and TiN-Ti composite, in n-alcohols of different carbon numbers were investigated. Corrosion-resistance of titanium metal in CH₃OH was lower than in other alcohols. Friction and wear of titanium metal, Ti-6Al-4V alloy and TiN-Ti composite decreased in the order. Especially, wear of TiN-Ti composite was much smaller than of the titanium metal and alloy. Friction of titanium-based materials in long chain alcohols was lower than in short chain alcohols, because the viscosity of n-alcohols increases with chain length. Wear of the titanium metal and alloy was affected by the polarity of n-alcohols. The amounts of total wear of those were larger in n-alcohols with small polarity, i.e., long chain alcohols. Wear of the TiN-Ti composite was affected by corrosion-resistance of titanium in n-alcohols, and the wear of TiN-Ti composite was conspicuous in the corrosive alcohols.