Application segmentation of the lanthanum market isolates five principal end‑uses that collectively define demand dynamics. Catalysts, chiefly in petroleum refining and automotive exhaust treatment, represent the largest share, accounting for roughly 35 % of total consumption; the high catalytic efficiency of lanthanum‑based oxides drives this dominance. Glass and ceramics, encompassing specialty optical glass, camera lenses, and high‑temperature ceramics, contribute about 30 % as manufacturers exploit lanthanum’s refractive index and thermal stability. Rechargeable nickel‑metal hydride (NiMH) batteries, used in hybrid‑electric vehicles and consumer electronics, absorb an estimated 20 % of the market, reflecting sustained but slowly declining growth amid competition from lithium‑ion technologies. Lighting applications, primarily in high‑intensity discharge lamps, occupy roughly 10 % of demand, where lanthanum improves arc stability and color rendering. The residual 5 % comprises niche uses such as polishing compounds, glass polishing, and research chemicals. This Lanthanum segmentation clarifies how each application contributes to overall market size and informs supply‑chain allocation.