  We study codimension-two BPS defects in 2d N=(2,2) supersymmetric gauge
theories, focusing especially on those characterized by vortex-like
singularities in the dynamical or non-dynamical gauge field. We classify
possible SUSY-preserving boundary conditions on charged matter fields around
the vortex defects, and derive a formula for defect correlators on the squashed
sphere. We also prove an equivalence relation between vortex defects and 0d-2d
coupled systems. Our defect correlators are shown to be consistent with the
mirror symmetry duality between Abelian gauged linear sigma models and
Landau-Ginzburg models, as well as that between the minimal model and its
orbifold. We also study the vortex defects inserted at conical singularities.
