Developing efficient non-precious electrocatalysts for the hydrogen evolution reaction (HER) is crucial to advancing scalable green hydrogen generation. Herein, vertically aligned TiO₂ nanotube arrays were directly grown on Ti substrates via electrochemical anodization and subsequently employed as a scaffold for the in situ hydrothermal growth of MoS₂ nanosheets. Among the investigated electrodes, MoS₂/TNT-2 exhibits the best electrochemical HER performance, achieving a current density of 10 mA cm⁻² at an overpotential of 353 mV in 1 M KOH. Moreover, the electrode maintains good electrochemical stability during a 24 h chronoamperometric test and after 2000 cyclic voltammetry sweeps. This work provides a facile route for constructing self-supported MoS₂/TiO₂ heterostructured electrodes for alkaline HER.