*

The quantum spin Hall (QSH) effect, characterized by counter-propagating spin-polarized edge states, was recently demonstrated in monolayers of the transition metal dichalcogenide 1T'-WTe₂. The presence of the QSH edge state is expected to be protected by time-reversal symmetry, however, the robustness of this topological protection and any potential scattering mechanisms remain largely unexplored in van der Waals heterostructures containing one or more layers of a QSH insulator. In this work, we use scanning tunneling microscopy and spectroscopy (STM/STS), to study the QSH edge state in WTe₂ bilayers for three different twist angles. We observe the characteristic spectroscopic signature of the QSH edge state in the twisted bilayers, including along a coinciding edge. In addition, we report the presence of the QSH edge state at a junction of a monolayer and an as-grown bilayer. By comparing our experimental observations to first principles calculations, we conclude that the constituent layers of the twisted bilayers are weakly coupled, in contrast to the topologically trivial as-grown bilayer, due to their larger interlayer spacing.