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We report superconducting resistive transition characteristics for array(s) of coupled 4‐Angstrom single wall carbon nanotubes embedded in aluminophosphate‐five zeolite. The transition was observed to initiate at 15 K with a slow resistance decrease switching to a sharp, order of magnitude drop between 7.5 and 6.0 K with strong (anisotropic) magnetic field dependence. Both the sharp resistance drop and its attendant nonlinear IV characteristics are consistent with the manifestations of a Berezinskii–Kosterlitz–Thouless transition that establishes quasi long range order in the plane transverse to the  c ‐axis of the nanotubes, leading to an inhomogeneous system comprising 3D superconducting regions connected by weak links. Global coherence is established at below 5 K with the appearance of a well‐defined supercurrent gap/low resistance region at 2 K.

1D goes 2D: A Berezinskii–Kosterlitz–Thouless transition in superconducting arrays of 4‐Angstrom carbon nanotubes