Abstract The Cenozoic convergence between the Indian and Asian plates has driven large‐scale mantle convection that interacts with both plates. Understanding this convergence benefits from clear imaging of the lithosphere‐asthenosphere boundary (LAB). Beneath the northeastern Indian plate margin, our Sp receiver functions (RFs) computed from dense array data reveal a regionally shallow LAB at an average depth of ∼70 km, except beneath the Indo‐Burma Ranges, where the Indian LAB dips eastward at an average of ∼20° down to ∼140 km; this dipping geometry is resolved primarily through SKS‐derived RFs. Farther east, a positive velocity gradient emerges ∼50–80 km beneath the Burma LAB, indicating an upper‐asthenospheric low‐velocity layer. Waveform modeling further indicates a sharp LAB, characterized by a Vs drop of up to ∼6%–10% over <∼20 km. These observations support melt presence below the LAB, potentially linked to the asthenospheric flow induced by the Indian plate subduction and subsequent rollback and/or tearing.