Owing to its excellent optical, electronic properties, good chemical and thermal stability, titanium dioxide (TiO₂) has been applied in promising energy technologies including new dye-sensitized solar cells, rechargeable batteries, supercapacitors, photocatalysts and gas sensors in recent years. However, wide band gap and poor electron transporting ability of TiO₂ has largely limited its application in some aspects like photocatalytic hydrogen generation and lithium ion batteries. Therefore, the modification of TiO₂ is essential for improving its optical and electrical properties. Graphene (GR), a two dimensional carbon nanostructure, is an ideal material to modify TiO₂ owing to its excellent electronic transport properties, exceptional thermal, and electrical conductivity. Compared to a pure TiO₂ nanostructure, the conjugation of GR leads to the increase of its adsorption capacity and photocatalytic activity, and improve the electrical conductivity and Li-ion diffusion pathways. In this review, we have firstly discussed pure TiO₂ nanostructures and introduced different methods for the preparation of TiO₂-graphene nanohybrids (TiO₂-GRNHs), and then discussed the practical applications of the TiO₂-GRNHs in different energy technologies. It is expected that the continuous breakthroughs in the synthesis and modifications of TiO₂-GRNHs will bring new high-performance materials with exotic properties and potential applications in emerging energy technologies.